Product Overview
Downtime on a discrete control line often traces back to an I/O base that can no longer handle the mix of sensor and actuator signals. The Schneider Electric 170ARM37030 is a Modicon Momentum discrete relay I/O base built to keep those signals moving. It combines ten discrete inputs and eight discrete outputs on one module, so a single base covers both sides of a control loop.
This is a practical choice for maintenance teams who want fewer spare part numbers on the shelf. The 170ARM37030 runs on a 24–230 V AC voltage rating, which means it fits panels already wired for common industrial supply levels. Input voltage limits sit at 3–30 V, giving you headroom for different sensor configurations without adding signal conditioners.
Technical Specifications
| Specification | Value |
|---|---|
| Discrete Inputs | 10 (IEC 1131-2 Type 1) |
| Discrete Outputs | 8 |
| Voltage Rating | 24–230 V AC |
| Input Voltage Limits | 3–30 V |
| Input Logic | Positive |
| Isolation (channels to bus) | 500 V AC |
| Isolation (between I/O groups) | 1780 V AC |
| Power Dissipation | ≤ 8.5 W |
| Protective Treatment | TC |
| Height | 5.6 in (141.5 mm) |
| Width | 4.9 in (125 mm) |
| Depth | 1.9 in (47.5 mm) |
| Net Weight | 0.57 lb (0.26 kg) |
| Marking | CE |
What These Specs Mean on the Floor
The 1780 V AC isolation between I/O channel groups is the number that matters most in mixed-signal cabinets. It keeps field wiring on one group from bleeding noise into another, which protects input readings and extends the life of downstream devices. The 500 V AC isolation between channels and bus does the same job for the backplane side.
Power dissipation of ≤ 8.5 W is modest for a base with this channel count. In a sealed enclosure, that lower heat load reduces the stress on neighboring components and can extend the service interval for the whole panel.
Where the 170ARM37030 Fits
Discrete relay I/O bases show up wherever a controller needs to read switches, proximity sensors, or pushbuttons and then drive relays, lamps, or small contactors. Three common settings:
- Pump and valve control rooms — ten inputs monitor limit switches and pressure trips while eight outputs command pilot devices.
- Packaging and material handling lines — positive input logic matches standard PNP sensor wiring, so retrofits move quickly.
- Oil and gas skid panels — the 24–230 V AC rating covers the supply levels found on many remote skids without a separate transformer.
Installation and Service Notes
Mount the base per the Modicon Momentum platform layout and keep field wiring separated by group to take full advantage of the channel-to-channel isolation. Because the input logic is positive, confirm sensor output type before landing wires. If you are replacing an older base, match the channel count and voltage rating first; the 170ARM37030 covers both 10-in and 8-out needs in one unit.
For maintenance, inspect terminal connections and enclosure seals on a regular schedule. The TC protective treatment helps resist the contaminants common in industrial air, but periodic visual checks still catch loose terminations before they become faults. Keep a spare base on the shelf and the swap is a job measured in minutes, not shifts.
Sourcing the 170ARM37030
Oil AutoTech supplies spares when you need them, with fast dispatch, worldwide. If you are specifying this base for a new panel or restocking for an existing line, our team can confirm the configuration against your application. Contact Oil AutoTech today for pricing and availability.
