Siemens 6ES7138-4DC01-0AB0 Replacement for ET 200S

Product Overview

Siemens 6ES7138-4DC01-0AB0 Replacement/Upgrade Solution for ET 200S: Seamless Transition from Legacy Digital Output Modules

The Siemens 6ES7138-4DC01-0AB0 is a 2-channel digital output module (2DO) designed for the SIMATIC ET 200S distributed I/O system, operating at 24 VDC with a rated output current of 0.5 A per channel. As aging SIMATIC S7-300 and S7-400 control architectures approach end-of-life and spare parts for legacy ET 200S configurations become increasingly scarce, plant engineers and procurement teams are actively seeking verified replacement and upgrade paths that minimize downtime, preserve existing wiring infrastructure, and avoid costly reprogramming cycles.

TOPNLMS maintains ready stock of the 6ES7138-4DC01-0AB0 and its compatible successors, sourced from authorized supply chains and subject to full functional testing prior to dispatch. Each unit ships with a 12-month warranty, a pre-shipment inspection report, and full traceability documentation — giving your maintenance and procurement teams the confidence to plan scheduled replacements or respond to unplanned failures without extended lead times.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from a legacy ET 200S digital output configuration involves more than swapping a single module. During the replacement process, engineers typically audit the entire distributed I/O station to identify other components approaching end-of-life or already discontinued. The 6ES7138-4DC01-0AB0 sits within a modular rack alongside the 6ES7151-1BA02-0AB0 IM 151-1 interface module, which handles PROFIBUS DP communication between the ET 200S station and the S7-300 or S7-400 CPU. If the interface module is also aging, replacing it concurrently avoids a second maintenance window.

The output module draws its 24 VDC load supply from a 6ES7138-4CA01-0AA0 PM-E power module installed in the same station. Verifying the power module’s condition during a 6ES7138-4DC01-0AB0 replacement is standard practice, as a degraded PM-E can cause intermittent output faults that are misdiagnosed as module failures. Similarly, the TM-E15S24-01 terminal module — the passive wiring carrier that the 6ES7138-4DC01-0AB0 plugs into — should be inspected for terminal wear or corrosion, particularly in high-vibration or humid environments.

For plants running mixed digital and analog I/O in the same ET 200S station, the 6ES7134-4FB01-0AB0 analog input module and 6ES7135-4GB01-0AB0 analog output module are common co-residents on the same backplane. Coordinating their replacement schedules with the digital output module reduces total installation labor and system downtime. Where the control system communicates over PROFINET rather than PROFIBUS, the 6ES7151-3BA23-0AB0 IM 151-3 PN interface module provides the network gateway function and may require a firmware update when new I/O modules are introduced to the station.

In modernization projects that extend beyond like-for-like replacement — for example, migrating from a SIMATIC S7-300 host controller to a SIMATIC S7-1500 or ET 200SP architecture — the distributed I/O strategy often shifts to 6ES7155-6AU01-0CN0 ET 200SP IM 155-6 PN interface modules paired with 6ES7132-6BF01-0CA0 4DO BaseUnit output modules. These newer platforms offer higher channel density, integrated diagnostics, and isochronous PROFINET support, while TOPNLMS can supply both the legacy 6ES7138-4DC01-0AB0 for immediate repair needs and the ET 200SP components for phased modernization.

Programming cable availability is another practical consideration: the 6ES7972-0CB20-0XA0 PC adapter USB remains the standard tool for STEP 7 online diagnostics and hardware configuration uploads when commissioning replacement modules on PROFIBUS DP networks, while TIA Portal users on PROFINET networks rely on standard RJ45 Ethernet connectivity directly to the CPU or switch.

Retrofit Guidance FAQ

Q: Can I install the 6ES7138-4DC01-0AB0 replacement without rewiring the terminal module?
A: Yes. The 6ES7138-4DC01-0AB0 plugs directly into the existing TM-E terminal module. All field wiring connections remain on the terminal module and are unaffected by the electronic module swap. No rewiring is required.

Q: Do I need to modify my STEP 7 or TIA Portal hardware configuration after installing the replacement?
A: No. A direct replacement using the same order number retains the existing hardware configuration. The CPU will recognize the module without requiring a new GSD import or hardware config download, provided the replacement module matches the original firmware generation.

Q: Is the replacement compatible with both PROFIBUS DP and PROFINET ET 200S stations?
A: Yes. The 6ES7138-4DC01-0AB0 is a local I/O module within the ET 200S station and is protocol-agnostic. Its compatibility is determined by the interface module (IM 151-1 for PROFIBUS or IM 151-3 PN for PROFINET), not by the output module itself.

Q: What is the physical installation space requirement?
A: The module occupies a single ET 200S slot on the DIN rail station. No additional cabinet space is required. The slim form factor is identical to the original, ensuring no mechanical interference with adjacent modules.

Q: How do I verify the replacement module is functioning correctly after installation?
A: After installation, perform a CPU STOP/RUN cycle and monitor the module’s SF (System Fault) and DO (Digital Output) LEDs. Use STEP 7 or TIA Portal online diagnostics to confirm the module is recognized and outputs are responding to program commands. TOPNLMS provides a pre-shipment functional test report for reference during commissioning.

Q: Can this module be used as a spare for multiple ET 200S stations with different configurations?
A: Yes. The 6ES7138-4DC01-0AB0 is a universal ET 200S 2DO module compatible with any ET 200S station that uses TM-E terminal modules. It can serve as a universal spare across multiple stations in the same facility.

Warranty Assurance

Every 6ES7138-4DC01-0AB0 unit supplied by TOPNLMS is covered by a 12-month warranty from the date of shipment. Prior to dispatch, each module undergoes a structured pre-shipment inspection that includes visual examination, power-on functional verification, and output channel load testing. A test report is included with each shipment.

In the event of a warranty claim, TOPNLMS provides a replacement unit or full refund within the warranty period, subject to inspection of the returned module. Our after-sales response target is 24 hours for initial acknowledgment and 72 hours for resolution proposal. Replacement units are dispatched from our Xiamen warehouse via DHL Express, FedEx International Priority, or equivalent tracked courier, with typical delivery times of 3–7 business days to most destinations worldwide.

For procurement teams requiring documentation for vendor qualification, TOPNLMS can provide a Certificate of Conformity, packing list, commercial invoice with HS code declaration, and country of origin certificate upon request. Bulk orders and standing purchase agreements for maintenance spare programs are supported with priority allocation and reserved stock arrangements.

To place an order, request a quotation, or discuss a retrofit project, contact our technical sales team directly.