SMC INR-244-755 Migration-Ready Fieldbus Power for EX Systems

Overview

SMC INR-244-755 Migration-Ready Fieldbus Power for EX Series Legacy Control Systems

The SMC INR-244-755 is a fieldbus manifold power supply designed for direct integration into EX Series valve terminal systems. As legacy automation lines face increasing pressure from discontinued spare parts and aging control infrastructure, the INR-244-755 serves as a verified migration-ready replacement for end-of-life fieldbus power modules in SMC EX500, EX250, and EX600 series manifold assemblies. Each unit is pre-shipment tested for output voltage stability, fieldbus signal integrity, and terminal continuity before dispatch. Stock is maintained for immediate fulfillment, and all units are covered by a support terms confirmed by quotation from date of shipment.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

When planning a retrofit around the INR-244-755, the scope of work typically extends beyond the power supply itself. In EX Series manifold assemblies, the fieldbus power supply works in close coordination with the SI unit (serial interface module), which handles fieldbus node addressing and protocol handshaking. If the SI unit — for example an EX500-SEN3 or EX600-SEN1 — is also at end-of-life, it is advisable to replace both the power supply and SI unit simultaneously to avoid a second unplanned outage.

On the valve terminal side, individual solenoid valve manifold blocks and output units such as the EX500-IE2 or EX600-DX0E may require re-addressing after the power supply is replaced, particularly if the original node configuration was stored in a failed unit. Technicians should retrieve the current I/O map from the PLC program or HMI tag database before beginning disassembly, as re-entry of valve addresses is a common source of commissioning delay.

For control cabinet wiring, the 24 VDC supply rail feeding the INR-244-755 should be verified for current capacity. EX Series manifold assemblies with high solenoid counts can draw significant inrush current at startup; if the existing power supply rail is shared with other 24 VDC loads such as proximity sensors or signal isolators, a dedicated branch with appropriate fusing is recommended. Where signal isolation is required between the fieldbus segment and the PLC I/O rack, a DIN-rail mounted signal isolator or repeater may be inserted without modifying the manifold wiring.

HMI screens referencing valve status from the EX Series manifold should be reviewed after commissioning. If the original fieldbus node address is preserved during replacement, HMI tag bindings will remain valid. If the node address changes — for example due to a rotary switch reset — HMI tag re-mapping will be required before returning the line to production. Programming cables compatible with the PLC platform (such as USB-SC09 for MELSEC or XW2Z for OMRON CJ/CS series) should be on-site during commissioning to allow rapid program verification and I/O force testing.

Downtime Control During System Migration

Minimizing unplanned downtime during an INR-244-755 replacement requires preparation at three levels: spare parts staging, program backup, and commissioning sequence planning.

Before shutdown, back up the PLC program from the controller managing the EX Series manifold. For MELSEC Q or iQ-R series controllers, use GX Works to export the project file including I/O parameter settings and network configuration. For OMRON CJ/CS series, use CX-Programmer to export the program and I/O table. Confirm that the fieldbus master configuration — including node count, baud rate, and I/O byte allocation — is documented before the manifold is de-energized.

During replacement, de-energize the 24 VDC supply to the manifold before disconnecting the INR-244-755. Label all terminal connections before removal. Install the replacement unit, reconnect terminals in sequence, and verify the fieldbus node address on the SI unit rotary switch matches the original configuration. Re-energize the supply and confirm the fieldbus master detects the node before releasing the line to production. Total replacement time for a prepared technician is typically 30–60 minutes, excluding HMI verification.

Where production continuity is critical, a hot-standby manifold assembly pre-wired and pre-addressed on a spare DIN rail section can be swapped as a complete unit, reducing in-cabinet work time to under 15 minutes. This approach is particularly effective in high-cycle pneumatic lines where even brief valve interruptions affect downstream process quality.

Retrofit Support FAQ

Q: Is the INR-244-755 a direct replacement for the original SMC EX Series fieldbus power supply?
A: Yes. The INR-244-755 is the correct replacement part for EX Series manifold assemblies using the standard fieldbus power supply slot. Confirm the manifold series (EX500, EX250, or EX600) and SI unit model before ordering to ensure full compatibility with your fieldbus protocol variant.

Q: What commissioning steps are required after installation?
A: After installing the INR-244-755, verify the 24 VDC supply voltage at the manifold terminals, confirm the SI unit node address matches the original PLC configuration, and cycle power to allow the fieldbus master to re-establish communication. Perform an I/O force test on each solenoid output before returning the line to automatic mode.

Q: Is pre-shipment testing performed on each unit?
A: Yes. Every INR-244-755 unit is tested for output voltage accuracy, fieldbus signal integrity, and terminal continuity before shipment. A test record is available on request.

Q: What support terms coverage applies?
A: All units are covered by a support terms confirmed by quotation from the date of shipment. Support terms covers manufacturing defects and verified functional failures under normal operating conditions. Contact [email protected] for support requests or technical support.

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INR-244-755
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Power Supplies

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DIN rail and switching power supplies

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