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Key Technical Specifications
- Product type: Discrete input base module, Modicon Momentum, Interbus-T
- Number of inputs: 32 discrete inputs (IEC 61131-2 Type 1)
- Input voltage: 24 V DC nominal (range approx. −3 to 30 V DC)
- Input logic: Positive (sink) logic; “True High” input type
- Input grouping: 2 groups of 16 inputs (commoned returns per group)
- Input current (per channel): ~2.5 mA minimum ON; ≤1.2 mA OFF; typical ~6 mA at 24 V DC
- Input resistance: ~4 kΩ per channel
- Response time: ~2.2 ms (0→1), ~3.3 ms (1→0)
- Isolation: 500 V AC between field and bus/communication interface; no channel-to-channel isolation
- Power consumption: ≤250 mA at 24 V DC (module operating current)
- Power dissipation: ~8.5 W max, ~5.5 W typical
- Protocol / bus: Interbus-T (remote I/O base for Interbus networks)
- Mounting: DIN rail / Momentum backplane base assembly with terminal block or busbar wiring
- Protection class: IP20 (when installed in appropriate enclosure)
- Weight: ~190 g (0.42 lb)
Product Introduction
The Schneider Electric 170BDI35600 is a Modicon Momentum discrete input base module for Interbus-T remote I/O systems. It provides 32 channels of 24 V DC positive-logic inputs, organized as two groups of 16, and is used to bring field sensor signals into an Interbus network via a Momentum base.
This module is chosen in legacy Interbus installations because it matches the original Momentum I/O architecture, supports standard 24 V DC sensors, and offers 500 V AC isolation between field and bus. It is discontinued by the manufacturer, so verified New Surplus or Refurbished stock is the practical path to maintain or expand existing Interbus/Momentum systems without a full platform migration.
170BDI35600
170BDI35600
170BDI35600
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| All 32 inputs read OFF | No 24 V DC to module or bus fault | ✅ High | Measure 24 V DC at L+/M− terminals; check Interbus bus LEDs on head adapter | Restore 24 V supply; verify Interbus configuration and bus termination |
| One group of 16 inputs dead | Open common return (M−) for that group | ✅ High | Measure voltage between L+ and group return; check wiring to terminal 17 (M−) per base docs | Re-terminate group return; check fuse or PSU branch for that group |
| Single channel stuck ON | External leakage or wiring short to L+ | ❌ Medium | Disconnect field device; measure voltage at input terminal with device removed | Fix field wiring; replace faulty sensor; check for induced voltage in cable tray |
| Single channel stuck OFF | Open circuit or failed input channel | ❌ Medium | Apply known-good 24 V DC to input terminal; monitor status in PLC | If still OFF with verified 24 V, module channel likely failed; replace module |
| Erratic input flicker | Noise, long unshielded cables, or shared return issues | ❌ Medium | Check cable routing; measure noise on 0–10 V AC range; inspect shared returns | Separate analog/digital cables; shorten runs; use dedicated returns per group |
| Interbus bus fault, module not recognized | Wrong GSD/config, address conflict, or bad base connection | ✅ Medium | Check Interbus config (GSD) for 170BDI35600; verify base seating and bus connectors | Correct GSD and address; reseat base; test with known-good Interbus head |
If stuck, send photos of terminal wiring, 24 V supply connections, and the Interbus head module configuration. We can review before you swap hardware.
Frequently Asked Questions (FAQ)
Q: Is the 170BDI35600 still available new from Schneider?
A: No. This module is discontinued by the manufacturer and is only available as New Surplus or Refurbished through specialized distributors.
Q: What is the difference between New Surplus and Refurbished for this module?
A: New Surplus means OEM original, factory-sealed, never installed. Refurbished means the module was removed from service, cleaned, electrically tested, and verified functional. We list the exact condition per unit and provide test reports on request.
Q: Can I use this module on non-Interbus networks (e.g., Modbus TCP, Profibus)?
A: No. The 170BDI35600 is an Interbus-T I/O base module. It must be used with an Interbus network and a compatible Interbus head/coupler. For Modbus TCP or Profibus, you need a different Momentum or M340/M580 architecture.
Q: How many inputs does this module provide and how are they grouped?
A: It provides 32 discrete inputs, arranged as 2 groups of 16 inputs each, with commoned returns per group. This affects how you wire sensor commons and how you troubleshoot dead groups.
Q: What input voltage and logic type does it support?
A: Nominal 24 V DC, with an operating range around −3 to 30 V DC, positive (sink) logic, IEC 61131-2 Type 1. ON state is guaranteed from about 11–30 V; OFF state up to about 5 V.
Q: Is there isolation between individual input channels?
A: No. There is 500 V AC isolation between the field side and the bus/communication interface, but no channel-to-channel isolation. A fault on one channel can affect others in the same group if wiring is incorrect.
Q: What warranty do you offer on obsolete stock like this?
A: Standard coverage is 1 year on New Surplus and Refurbished units, with a clear RMA process. We document incoming condition and functional test results so you know exactly what you are installing.
