Siemens 6ES7136-6DB00-0CA0 — SIL 3 Safety Output Module Guide

By Abdullah Zahid
13 min read
Siemens 6ES7136-6DB00-0CA0 F-DQ 4x24VDC 2A PM HF ET 200SP safety digital output module for machine interlocks

Siemens 6ES7136-6DB00-0CA0 F-DQ 4x24VDC/2A PM HF — ET 200SP Safety Digital Output Module Review, Specs, and Procurement Guide

Controls engineers specifying a SIL 3 / PL E digital output stage for an ET 200SP system typically arrive at the Siemens 6ES7136-6DB00-0CA0 after confirming their safety function demands fail-safe switching rather than standard industrial IO. This module — officially designated the F-DQ 4x24VDC/2A PM HF - SIMATIC DP Electronics Module for ET 200SP — delivers four transistor-switched 24 VDC outputs at 2 A per channel, with integrated short-circuit protection triggering above 3.3 A and open-circuit detection down to 8 mA, all within a 15 mm wide footprint on a BU type A0 base unit. If you are at the stage of validating current capacity, safety certification, and base unit compatibility, this article gives you the complete picture.

If you have already confirmed this is the right part, check current pricing and availability for the 6ES7136-6DB00-0CA0 at LeadTime.ca — ships worldwide.

Who Should Buy the 6ES7136-6DB00-0CA0 — and Who Shouldn't

This module is the right choice when your application requires a certified safety output stage integrated directly into an ET 200SP modular IO rack without external safety relays or protocol converters.

  • Your safety function mandates SIL 3 (IEC 61508) or PL E (ISO 13849-1) certification at the output stage
  • Your load current per channel does not exceed 2 A at 24 VDC, with a module-level total no greater than 6 A
  • Your ET 200SP baseframe uses BU type A0 (not BU type F0 or F1)
  • Your SIMATIC control system runs STEP 7 TIA Portal V12 or later, or STEP 7 V5.5 SP3+ for PROFIBUS-DP
  • Your installation operates between 0–60°C horizontal (or 0–50°C vertical) at an altitude of 4,000 m or below

If your load exceeds 2 A per channel, you need the F-DQ 2x24VDC/5A PM HF variant instead. If safety certification is not required, the non-fail-safe DQ 4x24VDC/0.5A (6ES7136-6BA00-0DA0) delivers a lower-cost alternative. Legacy PROFIBUS-only plants without PROFInet infrastructure may find the older S7-300 DP module family a less disruptive fit.

On this page:

What the 6ES7136-6DB00-0CA0 Actually Does in a Safety System

The Siemens 6ES7136-6DB00-0CA0 is a four-channel, transistor-based, fail-safe digital output module that sits between a SIMATIC PLC and 24 VDC field devices — solenoid valves, motor contactor pilots, indicator beacons, or machine interlocks — enforcing safety logic through PROFIsafe protocol compliance. Unlike a relay output module, it uses solid-state transistor switching, which eliminates mechanical wear and enables much faster diagnostic cycles. Each channel independently monitors load impedance: if the impedance rises above the open-circuit threshold (detected at 8 mA) or falls below the short-circuit limit (response above 3.3 A), the module raises a diagnostic alarm to the controller without requiring external monitoring hardware.

What distinguishes this module from standard industrial IO is its certified safety function. The 6ES7136-6DB00-0CA0 achieves PFDavg values below 2.00E-04 for SIL 2 low-demand mode and below 2.00E-05 for SIL 3 low-demand mode, and PFH values below 1.00E-08 per hour for SIL 2 continuous mode and below 1.00E-09 per hour for SIL 3 continuous mode. These figures apply at a 20-year proof-test interval with a 100-hour mean time to repair, and they allow engineers to directly replace external safety relay modules in many machine architectures without a separate safety PLC layer.

Typical System Architecture for ET 200SP Safety IO

The 6ES7136-6DB00-0CA0 sits at the output stage of the safety IO chain, converting PROFIsafe protocol commands from the controller into switched 24 VDC signals delivered to field actuators. It does not directly connect to the PROFINET cable — the bus interface is handled at the ET 200SP baseframe level.

  • SIMATIC S7 safety PLC (CPU with PROFIsafe or F-CPU) — generates fail-safe output commands via TIA Portal safety program
  • PROFINET or PROFIBUS-DP network cable — connects PLC to ET 200SP interface module on the baseframe
  • ET 200SP BU type A0 baseframe — provides backplane bus and 24 VDC power distribution to installed modules
  • 6ES7136-6DB00-0CA0 F-DQ module — receives PROFIsafe commands via backplane, switches four 24 VDC outputs, monitors load impedance on each channel
  • Field devices (solenoid valves, motor pilots, indicator lights, interlocks) — connected via screw terminals at 2 A per channel, up to 6 A module total

Where Engineers Deploy This Module

Machine safety interlocks represent the primary deployment scenario. Guard door enable logic, emergency stop relay replacement, and gate-controlled machine start sequences all require a certified fail-safe output path — the 6ES7136-6DB00-0CA0 satisfies that requirement directly, with each channel providing an independent SIL 3-rated switching path to a solenoid or interlock coil.

Pneumatic and hydraulic solenoid valve control at 2 A / 24 VDC per coil is a natural fit. Systems with up to four independent valve groups per module — common in food and beverage filling machines, pharmaceutical batch processing equipment, and automotive assembly pneumatic actuators — can be managed from a single module, with open-circuit detection on each channel providing immediate diagnostics if a coil burns out or a cable breaks.

Motor contactor and soft-start enable switching (low-current 24 VDC pilot signals to VFD enable circuits) benefits from the transistor output's fast switching and absence of contact wear. The module handles the logic-level switching only — it does not carry main motor power.

Indicator lights and beacon stacks (up to 10 W per channel, within the 2 A limit) on machine control panels can also be driven directly, reducing relay panel footprint in cabinet redesigns or machine retrofits.

Application Typical Deployment
Machine safety interlocks Guard door enable/disable, e-stop relay replacement on CNC and punch press equipment requiring SIL 3 output certification
Solenoid valve control Up to 4 pneumatic valve groups per module on packaging, filling, or assembly machines with 24 VDC coils ≤ 2 A
Motor contactor pilot switching 24 VDC enable signal to soft-start or VFD on pump/conveyor retrofits; no direct motor power handling
Indicator and beacon control Multi-color signal tower and panel lamp control (≤ 10 W per channel) to reduce relay count in control cabinets
Fail-safe load monitoring Critical actuator diagnostics on water treatment, pharmaceutical, or mining equipment where open-circuit faults must trigger operator alarm
Automotive assembly interlocks Robotic cell pneumatic valve and interlock switching with mandatory SIL 3 / PL E compliance per machinery directive

Purchase-Decision Specifications and Variant Comparison

Specification Value
Number of outputs 4 channels, 24 VDC nominal
Rated current per channel 2 A
Total module current limit 6 A (sum of all channels)
Supply voltage range 19.2–28.8 VDC
Module current draw (no load) 75 mA at rated voltage
Short-circuit response threshold Above 3.3 A
Open-circuit detection threshold 8 mA
Safety rating SIL 3 (IEC 61508) / PL E (ISO 13849-1)
Operating temperature (horizontal / vertical) 0–60°C / 0–50°C
Dimensions (W × H × D) 15 mm × 73 mm × 58 mm

Full technical specifications are available on the product page at LeadTime.ca.

Module Channels Current per Channel Safety Rating Interface Best For
6ES7136-6DB00-0CA0 (F-DQ 4x24VDC/2A PM HF) 4 2 A SIL 3 / PL E PROFINET / PROFIBUS-DP High channel density, 2 A loads, safety-required applications
F-DQ 2x24VDC/5A PM HF 2 5 A SIL 3 / PL E PROFINET / PROFIBUS-DP Higher per-channel current at cost of channel count
DQ 4x24VDC/0.5A (6ES7136-6BA00-0DA0) 4 0.5 A None (standard IO) PROFINET / PROFIBUS-DP Non-safety applications; lower cost where SIL not required
F-DP 4x24VDC/2A (6ES7132-6BH01-0BA0) 4 2 A SIL 3 PROFIBUS-DP only Legacy PROFIBUS plants; no PROFInet; generally replaced on new projects

If your system requires SIL 3-rated switching with four independent 24 VDC channels at 2 A each on an ET 200SP BU type A0 base, the 6ES7136-6DB00-0CA0 is the correct choice — check current availability and pricing at LeadTime.ca.

Expert Verdict: Strengths, Limits, and Procurement Reality

The 6ES7136-6DB00-0CA0 is genuinely well-suited to machine safety applications where eliminating a separate safety relay cabinet is the goal. The combination of SIL 3 / PL E certification, per-channel load diagnostics (open-circuit at 8 mA, short-circuit response above 3.3 A), and native PROFIsafe integration means engineers can build a complete certified output stage without additional gateway hardware. The 15 mm wide footprint on BU type A0 makes it one of the more space-efficient certified output options available in a modular IO platform, and the transistor switching avoids the contact wear and replacement cycle associated with relay-based alternatives on high-cycle applications like solenoid valves with continuous duty cycles.

The limits are real and worth stating plainly. At 2 A per channel, this module does not serve loads that draw more — solenoid coils or contactor pilots pulling above 2 A require the 5 A variant, with the trade-off of dropping to two channels. The inductive load switching frequency ceiling of 0.1 Hz per IEC 60947-5-1 DC-13 means this is not the right output module for rapid cycling of inductive loads; if your application cycles a solenoid faster than that, a snubber circuit or a redesigned switching scheme is required. And if your plant runs PROFIBUS-only infrastructure, you will need to evaluate whether a PROFInet upgrade is feasible before specifying the ET 200SP platform.

On procurement: lead times for this module have been running at 4–8 weeks for non-stock orders, and some distributors have shown backorder conditions. For machine builds with a firm startup deadline within six weeks, ordering immediately and carrying one spare is a defensible call — the module's role in a safety IO chain makes an unexpected stock-out a project-delaying event. If this matches your system requirements, view current stock and pricing at LeadTime.ca.

For volume pricing on multi-module orders or to confirm current lead time before committing to a build schedule, contact the LeadTime.ca team directly — we ship worldwide.

Wiring and Installation Overview

  • The module slides onto an ET 200SP BU type A0 baseframe using a keyed connector — verify the baseframe type before installation, as BU type F0 and F1 use different module heights and keying configurations.
  • Supply voltage must be within 19.2–28.8 VDC at the baseframe terminals; reverse polarity protection is active but outputs will remain inactive if polarity is reversed.
  • Each of the four output channels connects the load between its dedicated screw terminal and the common return (GND) rail; maximum cable length is 1,000 m shielded or 500 m unshielded.
  • Use shielded twisted-pair cable for long runs or installations adjacent to variable frequency drives or high-frequency switching equipment to maintain EMC performance.
  • The module communicates via the ET 200SP backplane bus — no separate IO cable from module to controller is required; PROFINET or PROFIBUS-DP cabling connects at the baseframe interface module only.

Commissioning Steps Overview

  • Add the F-DQ 4x24VDC/2A PM HF block to the ET 200SP rack in STEP 7 TIA Portal V12 or later (or STEP 7 V5.5 SP3+ for PROFIBUS-DP); auto-configuration detects module type and I&M data.
  • Map each of the four output channels to Q-byte addresses in the safety program and configure PROFIsafe parameters for any safety function in use.
  • Power up the baseframe and verify the RUN LED (green) is active and no ERROR LED (red) is present before enabling outputs.
  • Test each channel with a representative load — solenoid valve, indicator light, or a resistive test load of at least 12 Ω — and confirm output voltage at logic 1 and residual current at logic 0.
  • Document the commissioning date and schedule the next proof-test per your local safety authority requirements, noting the module's rated 20-year proof-test interval at 100-hour MTTR.

Compatible Base Units and System Expansion

The 6ES7136-6DB00-0CA0 installs exclusively on the ET 200SP BU type A0 base unit. Confirm baseframe type before ordering. Additional modules that integrate within the same ET 200SP rack include:

  • F-DQ 2x24VDC/5A PM HF — fail-safe two-channel output at 5 A per channel for higher-current loads on the same BU type A0 baseframe
  • DQ 4x24VDC/0.5A (6ES7136-6BA00-0DA0) — standard (non-fail-safe) digital output module for non-safety IO expansion on the same rack
  • F-DA 4x24VDC (6ES7136-6DE00-0CA0) — fail-safe analog output module for process control signals (4–20 mA) where binary switching is not sufficient
  • ET 200SP interface module — connects the assembled baseframe and modules to the PROFINET or PROFIBUS-DP network; must be selected to match your network type before specifying this output module

What Engineers Get Wrong When Ordering This Part

Before submitting a purchase order for the 6ES7136-6DB00-0CA0, verify every item on this checklist — these are the most common sources of wrong-part orders and installation delays:

  1. Base unit type is BU type A0 (NOT BU type F0 which requires different module height/keying)?
  2. Power supply can deliver 24 VDC at 75 mA module current + load current (max 6 A outputs @ 24 V = 144 W peak)?
  3. Application truly requires fail-safe (SIL 3 / PL E) or is standard industrial IO sufficient (cost trade-off)?
  4. Load impedance range 12-2,000 Ω met (no subohm short faults, no open-circuit indefinitely)?
  5. Installation altitude ≤ 4,000 m and operating temp 0-60°C horizontal (derating applies > 2,000 m)?
  6. Existing SIMATIC control system supports PROFIsafe (STEP 7 TIA V12+ or Automation Tool V5.5 SP3+)?
  7. Shielded cable (≤ 1,000 m) or unshielded (≤ 500 m) available for wiring runs?
  8. Proof-test interval fits maintenance schedule (fail-safe specs assume 20-year interval, 100-hour repair window)?

If any item above is unresolved, contact the LeadTime.ca team before ordering — we can help confirm compatibility with your existing baseframe and software version, or identify the correct variant if your current requirements fall outside this module's ratings. Alternatively, view the product page for the full datasheet and documentation links.

Frequently Asked Questions

Does the 6ES7136-6DB00-0CA0 require a separate safety PLC, or can it work with a standard SIMATIC CPU?

This module requires a SIMATIC controller that supports PROFIsafe — a fail-safe CPU (F-CPU) or a standard CPU with PROFIsafe capability running TIA Portal V12 or later for PROFINET, or STEP 7 V5.5 SP3 or later for PROFIBUS-DP. A non-safety SIMATIC CPU cannot activate the certified safety functions of this module, though the module may still operate as a standard output under those conditions without the SIL 3 / PL E guarantee.

What happens when the 6ES7136-6DB00-0CA0 detects a short circuit on one channel — does the whole module shut down?

No. When a channel detects a load impedance below 12 Ω, triggering the short-circuit response above 3.3 A, that channel's transistor enters current-limiting mode and the output drops to 0 V. The remaining channels continue operating normally. Recovery is automatic once the short circuit is cleared — no manual reset of the module is required.

Can the 6ES7136-6DB00-0CA0 be used with PROFIBUS-DP only, without PROFINET?

Yes, provided the ET 200SP interface module on the baseframe is a PROFIBUS-DP variant and the engineering tool is STEP 7 V5.5 SP3 or later. However, for new system designs, Siemens and most integrators now specify PROFINET. For legacy PROFIBUS-only plants without upgrade plans, the older S7-300 F-DP module family (such as the 6ES7132-6BH01-0BA0) may reduce network infrastructure changes, though it is generally being phased out in favor of ET 200SP on new projects.

What is the maximum switching frequency for inductive loads like solenoid valves?

The maximum switching frequency for inductive loads per IEC 60947-5-1 DC-13 is 0.1 Hz. Attempting to cycle a solenoid valve faster than this limit can cause incomplete energization, coil chattering, or erratic behavior. If your application requires faster inductive switching, an RC snubber or diode clamp across the coil, combined with program-level frequency control, is the standard engineering mitigation.

How do I size the 24 VDC power supply for a rack that includes this module?

Start with the module's unloaded current draw of 75 mA, then add the load current for each active channel — up to 2 A per channel, capped at 6 A total across all four channels. For a fully loaded module at 24 VDC, the output stage alone accounts for up to 144 W. Add the current draw of all other modules on the baseframe and apply your standard safety margin (typically 20–25%) to arrive at the minimum PSU rating. Confirm the supply can maintain output within 19.2–28.8 VDC under all load conditions.

What is the realistic lead time for the 6ES7136-6DB00-0CA0, and should I order a spare?

Current market conditions show lead times of 4–8 weeks for new units from distribution. For any machine build with a startup deadline within six weeks, ordering immediately is advisable. Carrying one spare module is a practical hedge given the module's role in a fail-safe output chain — an unplanned replacement need during machine operation, without a spare on hand, can mean days of production downtime waiting for delivery.

Why Order From LeadTime.ca

  • Global shipping on all orders — no regional restrictions; LeadTime.ca sources and ships the 6ES7136-6DB00-0CA0 worldwide
  • Hard-to-source modules and backorder situations handled through distributor network relationships — contact the team for current stock visibility before committing to a timeline
  • Volume pricing available for multi-unit and project-level orders; purchases of 5 or more units may qualify for meaningful discounts — inquire directly
  • Fast response on technical pre-sales questions — confirm baseframe compatibility, software version requirements, and lead time in one conversation

At-a-Glance Summary

  • Model: Siemens 6ES7136-6DB00-0CA0 — F-DQ 4x24VDC/2A PM HF, SIMATIC ET 200SP electronics module
  • 4 transistor-switched 24 VDC outputs at 2 A per channel; 6 A maximum total across all channels
  • Safety certifications: SIL 3 per IEC 61508, PL E per ISO 13849-1
  • PFDavg below 2.00E-05 (SIL 3 low-demand); PFH below 1.00E-09 per hour (SIL 3 continuous) at 20-year proof-test interval
  • Short-circuit response above 3.3 A; open-circuit detection at 8 mA — both fully integrated, no external monitoring required
  • Supply voltage range: 19.2–28.8 VDC; module current draw 75 mA unloaded
  • Operating temperature: 0–60°C horizontal, 0–50°C vertical; maximum altitude 4,000 m
  • Footprint: 15 mm × 73 mm × 58 mm; weight 57 g — among the most compact certified safety output modules in the ET 200SP family
  • Compatible base unit: ET 200SP BU type A0 only — verify before ordering
  • Engineering tool requirement: STEP 7 TIA Portal V12+ (PROFINET) or STEP 7 V5.5 SP3+ (PROFIBUS-DP)
  • Typical distributor lead time: 4–8 weeks for new units — order early for deadline-driven machine builds