Siemens 6ES7138-4CB11-0AB0 Replacement for ET 200S Series

Product Overview

Siemens 6ES7138-4CB11-0AB0 Replacement for ET 200S Series: Smooth Transition & Legacy System Compatibility

The Siemens 6ES7138-4CB11-0AB0 is a PM-E 24 VDC power module designed for the SIMATIC ET 200S distributed I/O system. As aging ET 200S installations approach end-of-life or face discontinued spare-part availability, plant engineers and procurement teams increasingly require a verified, drop-in replacement that preserves existing wiring infrastructure, maintains PROFIBUS DP or PROFINET communication integrity, and eliminates the need for costly panel redesigns or PLC program rewrites.

TOPNLMS supplies the 6ES7138-4CB11-0AB0 from verified stock, fully tested prior to shipment, and backed by a 12-month warranty. Whether you are executing a planned maintenance window, responding to an unplanned failure, or executing a phased migration from an older Siemens S5 or early S7-300 distributed I/O architecture to a modern ET 200S or ET 200SP platform, this module is engineered to restore system availability with minimal intervention.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful ET 200S power module replacement rarely occurs in isolation. During a typical migration or emergency repair, the 6ES7138-4CB11-0AB0 is installed alongside a range of complementary components that must be verified for compatibility before the system is returned to service.

The IM 151-1 interface module (6ES7151-1AA05-0AB0) or its PROFINET variant, the IM 151-3 PN (6ES7151-3BA23-0AB0), serves as the communication head for the ET 200S station. When replacing the PM-E power module, confirming the firmware revision of the interface module ensures that the new power module is correctly recognized during GSD-based hardware configuration in STEP 7 or TIA Portal. If the existing IM 151 is also at end-of-life, a simultaneous upgrade to the IM 151-3 PN enables a migration path from PROFIBUS DP to PROFINET without replacing the entire I/O station.

Digital and analog I/O modules within the same ET 200S rack — such as the 2DO 24VDC/0.5A (6ES7132-4BB30-0AB0) or the 2AI U (6ES7134-4FB01-0AB0) — share the same terminal module infrastructure. Because the TM-P terminal module retains all field wiring independently of the electronic module, replacing the PM-E power module does not disturb the wiring of adjacent I/O modules, significantly reducing the risk of wiring errors during maintenance.

For installations where the ET 200S station is powered from a SITOP PSU100S 24V/10A (6EP1334-2BA20) or similar SITOP power supply, verifying the upstream supply voltage stability is a recommended pre-commissioning step. Voltage dips below 19.2 V during motor starts or solenoid switching can cause nuisance power module faults; a SITOP selectivity module such as the 6EP1961-2BA11 can isolate load groups and prevent cascading shutdowns.

In control cabinets where the ET 200S is mounted alongside a SIMATIC S7-300 CPU (e.g., CPU 315-2 DP, 6ES7315-2AH14-0AB0) acting as the PROFIBUS DP master, the replacement of the PM-E module requires no changes to the S7-300 hardware configuration or the OB/FC program structure, provided the GSD file version matches. The CPU continues to address the ET 200S station at the same PROFIBUS address, and the I/O process image remains unchanged.

Where the migration scope extends beyond a single module, engineers often simultaneously evaluate the ET 200S motor starter modules (e.g., 3RK1301-0AB10-1AA2) and associated PROFIBUS DP bus connectors (6ES7972-0BB52-0XA0) for age-related replacement. Addressing these components in a single planned outage minimizes total downtime compared to sequential, reactive replacements.

For sites transitioning from legacy Siemens S5-115U or S5-135U distributed I/O to the ET 200S platform, a SIMATIC programming cable (PC Adapter USB A2, 6ES7972-0CB20-0XA0) is typically required to load updated hardware configurations and perform online diagnostics via STEP 7 or TIA Portal V16/V17 during commissioning.

Retrofit Guidance FAQ

Q: Can I replace the 6ES7138-4CB11-0AB0 without rewiring the terminal module?
A: Yes. The ET 200S design separates the electronic module from the terminal module (TM-P). Field wiring remains on the TM-P and is not disturbed when the PM-E electronic module is swapped. Simply unlock the electronic module, slide it out, insert the replacement, and re-engage the locking lever.

Q: Do I need to update the STEP 7 or TIA Portal hardware configuration?
A: For a like-for-like replacement of the same order number and hardware revision, no configuration change is required. If the hardware revision differs, verify the GSD file version in your PROFIBUS configuration. In most cases, the existing configuration remains valid.

Q: Is this module compatible with PROFINET as well as PROFIBUS DP?
A: The PM-E power module itself is communication-protocol agnostic — it provides 24 VDC power segmentation within the ET 200S station. Communication protocol (PROFIBUS DP or PROFINET) is determined by the interface module (IM 151 variant) installed at the head of the station. This module is compatible with both IM 151-1 (PROFIBUS) and IM 151-3 PN (PROFINET) configurations.

Q: What is the physical installation space requirement?
A: The 6ES7138-4CB11-0AB0 occupies a single ET 200S slot on a standard 35 mm DIN rail. No additional panel space is required compared to the module being replaced. Cabinet depth and rail spacing requirements are identical to all other ET 200S electronic modules.

Q: Can this module be used to replace modules from other manufacturers in a mixed-vendor panel?
A: This module is designed exclusively for the Siemens SIMATIC ET 200S system. It is not interchangeable with I/O modules from other distributed I/O platforms. For mixed-vendor migration projects, signal isolators or protocol converters may be required at the system boundary.

Q: How do I verify the module is functioning correctly after installation?
A: After installation, power up the ET 200S station and observe the green PWR LED on the PM-E module. Use STEP 7 HW Config or TIA Portal Device View to perform an online comparison. The module should appear with a green status indicator. If a red SF LED is present, check the PROFIBUS address assignment and GSD file compatibility.

Warranty Assurance

Every 6ES7138-4CB11-0AB0 unit shipped by TOPNLMS undergoes pre-shipment functional testing to verify power output, load group switching, and LED diagnostic behavior. Units are inspected for physical integrity, connector condition, and firmware label consistency before packaging.

All units are covered by a 12-month warranty from the date of shipment. In the event of a confirmed module failure within the warranty period, TOPNLMS will provide a replacement unit or issue a refund, subject to return inspection. Warranty claims are processed within 3 business days of receiving the returned unit.

TOPNLMS maintains stock of the 6ES7138-4CB11-0AB0 and related ET 200S components to support both planned procurement and emergency replacement scenarios. Standard lead time for in-stock units is 1–3 business days for international express shipment from Xiamen, China. Expedited same-day dispatch is available for orders confirmed before 14:00 CST.

For volume procurement, OEM integration projects, or multi-site maintenance contracts, contact our technical sales team to discuss pricing, lead time, and consignment stock arrangements.