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The Siemens 6ES7138-4FB03-0AB0 is the PM-E DC 24V Power Module for the ET 200S distributed I/O system — a cornerstone component in countless SIMATIC S7-300 and S7-400 automation architectures deployed across manufacturing, process control, and infrastructure industries. As production lines age and original equipment manufacturers phase out legacy hardware, sourcing a verified, drop-in replacement for the 6ES7138-4FB03-0AB0 becomes a critical priority for maintenance engineers and procurement teams alike.
At TOPNLMS, we stock the 6ES7138-4FB03-0AB0 specifically to support facilities undergoing control system modernization — whether that means a like-for-like spare replacement to restore a downed line, or a phased migration from an aging SIMATIC S7-300 rack to a newer distributed architecture. Every unit is inspected and tested before dispatch, backed by a 12-month warranty, and ships from our Xiamen warehouse with full documentation.
| Parameter | 6ES7138-4FB03-0AB0 (This Unit) | Typical Legacy / Predecessor |
|---|---|---|
| Product Family | ET 200S Distributed I/O | ET 200S / S7-300 Local I/O |
| Module Type | PM-E DC 24V Power Module | PM-E DC 24V (earlier revisions) |
| Supply Voltage | DC 24 V (20.4–28.8 V) | DC 24 V |
| Output Current | Up to 10 A load group | Up to 10 A load group |
| Mounting | ET 200S terminal module (TM-P) | ET 200S terminal module (TM-P) |
| Communication Interface | PROFIBUS DP / PROFINET (via IM 151 interface module) | PROFIBUS DP (via IM 151-1) |
| Wiring Compatibility | Direct plug-in to existing TM-P terminal module — no rewiring required | Same TM-P footprint |
| Installation Space | Standard ET 200S slot width | Standard ET 200S slot width |
| Replacement Recommendation | ✅ Direct drop-in replacement | — |
| Warranty | 12 Months (TOPNLMS) | OEM warranty expired |
A power module replacement rarely happens in isolation. When migrating or maintaining an ET 200S station, the 6ES7138-4FB03-0AB0 typically works alongside a broader set of components that must be verified for compatibility. The IM 151-1 interface module (e.g., 6ES7151-1AA05-0AB0) is the communication backbone of the ET 200S station, connecting the distributed I/O rack to the PROFIBUS DP or PROFINET network; confirming its firmware version ensures the PM-E power module is correctly recognized after replacement.
On the I/O side, 2DI DC 24V digital input modules and 2DO DC 24V/0.5A digital output modules share the same load group powered by this PM-E unit — verifying their terminal module (TM-E) seating and wiring integrity during a power module swap prevents nuisance faults on restart. For analog signal chains, 2AI I 2-wire ST analog input modules in the same station should be checked for correct shielding and grounding after any power interruption.
Upstream, the SIMATIC S7-300 CPU (such as a CPU 315-2 DP or CPU 317-2 PN/DP) communicates with the ET 200S station via the IM 151 interface module. During a migration from S7-300 to S7-1500, the ET 200S station can often be retained as a remote I/O node connected through a PROFINET IO network, with the 6ES7138-4FB03-0AB0 continuing to serve its power distribution role unchanged — significantly reducing the scope and cost of the control system upgrade.
For sites transitioning to TIA Portal engineering, a PC Adapter USB A2 or SIMATIC NET CP 5711 programming cable is required to re-download the hardware configuration after module replacement. If the existing STEP 7 project is being migrated to TIA Portal V17 or later, the ET 200S hardware catalog entries map directly, preserving I/O addressing and minimizing program rework. Additionally, 24V DC power supply units (such as SITOP PSU100S 10A) feeding the ET 200S station should be load-tested to confirm they can sustain the full station current draw after any expansion or reconfiguration.
In control cabinet retrofit projects, signal isolators and surge protection modules installed on field wiring terminals should be inspected alongside the power module replacement — particularly in environments with long cable runs or high electromagnetic interference. Proper grounding of the ET 200S mounting rail and shielding of PROFIBUS cables remain essential to stable operation after any hardware change.
Q: Can I replace the 6ES7138-4FB03-0AB0 without rewiring the terminal module?
A: Yes. The PM-E DC 24V power module plugs directly into the existing TM-P terminal module. Field wiring connected to the terminal module does not need to be disturbed, which minimizes downtime during replacement.
Q: Do I need to update the STEP 7 or TIA Portal hardware configuration after swapping this module?
A: If the replacement is the same order number (6ES7138-4FB03-0AB0), no hardware configuration change is required. The CPU will recognize the module automatically on the next power cycle. If upgrading to a different PM-E variant, a hardware configuration download via the programming cable will be necessary.
Q: Is this module compatible with both PROFIBUS DP and PROFINET ET 200S stations?
A: Yes. The PM-E power module is independent of the communication protocol used by the IM 151 interface module. It is compatible with ET 200S stations running PROFIBUS DP (via IM 151-1) and PROFINET IO (via IM 151-3 PN).
Q: What should I check if the ET 200S station does not come online after replacing the power module?
A: Verify that the 24V DC supply voltage at the terminal module is within the 20.4–28.8V range, confirm the TM-P terminal module is correctly seated on the mounting rail, and check that the PROFIBUS/PROFINET cable is undamaged and properly terminated. Review the CPU diagnostic buffer for any SF or BF fault codes.
Q: Can this module be used in a migration from S7-300 to S7-1500?
A: Yes. The ET 200S station, including this PM-E module, can be retained as a PROFINET remote I/O node when migrating the controller from S7-300 to S7-1500. This approach allows a phased migration strategy, reducing capital expenditure and installation risk.
Every 6ES7138-4FB03-0AB0 unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each module undergoes functional verification including supply voltage input range testing, output load group continuity checks, and visual inspection for connector and housing integrity. Units are packed in anti-static protective packaging with individual labeling to ensure traceability.
In the event of a confirmed defect within the warranty period, TOPNLMS provides replacement dispatch or credit resolution within agreed lead times. Our technical support team is available to assist with installation queries, compatibility confirmation, and fault diagnosis to minimize your downtime. We understand that unplanned outages in industrial environments carry significant operational costs — our procurement and logistics processes are designed to support urgent replacement requirements with priority handling.
For volume orders, scheduled blanket purchase agreements, or multi-site maintenance contracts, please contact our sales team directly to discuss pricing, lead times, and consignment stocking arrangements.
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