Weidmuller UR20-4DI-P 1315700000 Retrofit-Ready Digital Input for u-remote Control Systems
The Weidmuller UR20-4DI-P (Part No. 1315700000) is a 4-channel PNP digital input module engineered for the u-remote I/O system — Weidmuller’s modular, DIN-rail-mounted remote I/O platform widely deployed in distributed control architectures. As legacy fieldbus-based systems reach end-of-life and industrial facilities accelerate migration to EtherNet/IP, PROFINET, and EtherCAT backbones, the UR20-4DI-P serves as a direct, wiring-compatible replacement for discontinued or aging digital input nodes, enabling smooth system modernization without full panel redesign.
Whether you are upgrading a PROFIBUS DP network to PROFINET, consolidating scattered I/O racks into a centralized u-remote head station, or simply restocking critical spare parts to protect production continuity, the UR20-4DI-P integrates seamlessly into existing u-remote backplane assemblies. Its compact 12.5 mm width, push-in terminal wiring, and plug-and-play module addressing eliminate the need for re-engineering terminal layouts or modifying PLC programs — a critical advantage when downtime windows are measured in hours, not days.
Upgrade Compatibility Table
| Parameter | UR20-4DI-P (1315700000) | Notes / Retrofit Guidance |
|---|---|---|
| Input Channels | 4 × PNP Digital Input | Compatible with 24 VDC PNP sensors; NPN field devices require signal converter |
| Input Voltage | 24 VDC (18–30 VDC) | Verify field power supply capacity before installation |
| Backplane Interface | u-remote system bus | Plug directly into UR20 backplane; no additional bus coupler required |
| Module Addressing | Automatic (slot-based) | Module address assigned by physical slot position; update PLC I/O map if slot changes |
| Terminal Wiring | Push-in spring clamp, 0.14–1.5 mm² | Existing field wiring reusable; no re-termination required for same wire gauge |
| Communication Compatibility | PROFINET, EtherNet/IP, EtherCAT, Modbus TCP (via head station) | Protocol determined by UR20 head station (e.g. UR20-FBC-PN-IRT for PROFINET) |
| Replacement Fit | Direct drop-in for UR20-4DI-P variants | Confirm firmware version of head station supports module generation |
| Commissioning | Plug-and-play; GSD/GSDML file update may be required | Download latest GSDML from Weidmuller’s product portal before commissioning |
| Warranty | 12 Months | Covers manufacturing defects; includes pre-shipment functional test |
Retrofit Planning for Existing Automation Systems
Successful integration of the UR20-4DI-P into a retrofit project requires a structured review of the surrounding control architecture. In most u-remote deployments, the digital input module operates alongside a UR20-FBC-PN-IRT head station (PROFINET interface) or a UR20-FBC-EIP head station (EtherNet/IP interface), which manages all upstream communication to the PLC. Before swapping a failed or obsolete input module, engineers should verify that the head station firmware is current and that the GSDML or EDS file loaded in the engineering tool matches the installed module generation.
On the power supply side, the u-remote system separates field power from system bus power. The UR20-4DI-P draws system bus current from the backplane, while field sensor power is supplied through dedicated power feed modules such as the UR20-PF-O-1DI-SIL or standard UR20-1COM-232-485-422 power feed terminals. Before adding additional UR20-4DI-P modules to an existing rack, calculate the cumulative system bus current draw to ensure the installed power supply — typically a Weidmuller PRO ECO 24VDC or equivalent — has sufficient headroom. Overloading the bus power segment is a common cause of intermittent faults during rack expansion projects.
Terminal wiring compatibility is one of the strongest advantages of the UR20 platform. The push-in spring clamp terminals accept conductors from 0.14 mm² to 1.5 mm² without tools, and the existing field cable harness can typically be transferred directly from a failed module to its replacement. However, if the original installation used ferrules, inspect for corrosion or deformation before re-insertion. Label each conductor before removal using the original panel drawings, and photograph the terminal face as a reference during reassembly.
For projects involving protocol migration — for example, moving from a legacy PROFIBUS DP network using a UR20-FBC-PB head station to a PROFINET architecture — the UR20-4DI-P modules themselves require no modification. Only the head station is replaced, and the I/O module configuration is re-imported via the new GSDML file. This modular architecture significantly reduces retrofit scope and allows phased migration: the field I/O layer remains intact while the communication layer is upgraded independently.
In control cabinet upgrade projects, the UR20-4DI-P is frequently deployed alongside UR20-4DO-P digital output modules, UR20-4AI-UI-16 analog input modules, and UR20-2CNT-100 counter modules to build a complete mixed I/O rack. When expanding an existing rack, always insert new modules at the end of the existing configuration to avoid shifting slot addresses and invalidating the PLC program’s I/O mapping. If mid-rack insertion is unavoidable, update the hardware configuration in TIA Portal, Studio 5000, or the applicable engineering environment, download the revised configuration to the PLC, and perform a full I/O force test before returning the system to automatic mode.
Downtime Control During System Migration
Minimizing unplanned downtime is the primary concern in any live-system retrofit. For the UR20-4DI-P replacement, the recommended procedure is to pre-configure and bench-test the replacement module before the maintenance window begins. Connect the module to a spare u-remote rack or a portable test fixture, apply 24 VDC field power, and verify that all four input channels respond correctly to a test signal source. This pre-shipment functional test — included with every unit supplied by SMARTNEXMSK — confirms the module is operational before it reaches the production floor.
During the maintenance window, follow a structured hot-swap procedure where the u-remote system supports it: place the head station in STOP mode via the PLC, remove the failed module, insert the replacement, and resume operation. For systems that do not support hot-swap, coordinate a controlled shutdown of the affected control zone, document the current state of all output signals, and use the PLC’s force table to hold critical outputs in their last known safe state during the swap interval. After module insertion, verify that the head station recognizes the new module (LED status indicators should show green), confirm I/O data exchange in the PLC diagnostic view, and release forced outputs in reverse order of application.
Preserving the original program logic is non-negotiable. The UR20-4DI-P uses the same data structure as its predecessor, so no program modifications are required for a like-for-like replacement. If the module is being installed in a new slot as part of a rack expansion, update only the hardware configuration layer — not the program logic — and use symbolic addressing in the PLC program to insulate the application code from hardware address changes. This approach protects years of validated control logic while accommodating the physical changes required by the retrofit.
Retrofit Support FAQ
Q1: Is the UR20-4DI-P 1315700000 a direct replacement for older UR20 digital input modules?
Yes. The UR20-4DI-P 1315700000 is mechanically and electrically compatible with earlier UR20-4DI-P variants. It plugs into the same backplane slot, uses the same terminal wiring layout, and is recognized by the same GSDML/EDS device description files. In most cases, no PLC program changes are required for a like-for-like swap.
Q2: What commissioning steps are required after installation?
After physical installation, power up the u-remote rack and confirm the module’s LED status indicators show normal operation (green RUN, no fault). In the PLC engineering tool, perform an online comparison between the configured hardware and the detected hardware. If the module generation differs from the previously installed unit, update the GSDML file and re-download the hardware configuration. Perform a full I/O channel test using the PLC’s force/monitor function before releasing the system to automatic operation.
Q3: Can this module be used with both PROFINET and EtherNet/IP head stations?
Yes. The UR20-4DI-P is protocol-agnostic at the module level. It communicates with the u-remote system bus regardless of the fieldbus protocol used by the head station. The same physical module can be used in racks managed by a PROFINET head station (UR20-FBC-PN-IRT), an EtherNet/IP head station (UR20-FBC-EIP), or an EtherCAT head station, making it suitable for multi-protocol plant environments and phased protocol migration projects.
Q4: What does the 12-month warranty cover, and what pre-shipment testing is performed?
Every UR20-4DI-P 1315700000 supplied by SMARTNEXMSK carries a 12-month warranty covering manufacturing defects and functional failures under normal operating conditions. Prior to shipment, each unit undergoes a functional test verifying channel response, terminal integrity, and backplane connector condition. Units that fail pre-shipment testing are quarantined and not dispatched. Warranty claims are processed within 5 business days of receipt of the returned unit, with replacement or repair at no additional cost to the customer.
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