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The ST-1218 is a compact, high-density digital input module from the PACSystems RSTi distributed I/O family (formerly GE Fanuc, now Emerson). Designed for industrial automation and remote I/O architectures, this...
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The ST-1218 is a compact, high-density digital input module from the PACSystems RSTi distributed I/O family (formerly GE Fanuc, now Emerson). Designed for industrial automation and remote I/O architectures, this module provides 8 discrete input channels for monitoring field devices such as proximity switches, limit switches, and push buttons.
The ST-1218 utilizes a Sink (Positive Logic / PNP) configuration, accepting 12/24V DC signals and converting them into logical data for the PLC or network adapter.
To ensure stable operation in electrically noisy environments, the module features optocoupler isolation between field-side I/O and internal logic circuits. Its ultra-slim 12 mm width maximizes cabinet space efficiency, while the color-coded spring-clamp (cage clamp) terminals enable fast, tool-free wiring.
The module is compatible with industrial network adapters supporting PROFINET, PROFIBUS, EtherCAT, and Modbus TCP, making it a flexible solution for distributed control systems.
| Parameter | Specification |
|---|---|
| Model Number | ST-1218 |
| Input Current | ≤ 6 mA per channel @ 28.8V DC |
| Response Time | ≤ 3 ms (OFF→ON) / ≤ 3 ms (ON→OFF) |
| Internal Current Consumption | 35 mA @ 5.0V DC (System Power) |
| Isolation | Photocoupler isolation (I/O to logic) |
| Wiring Method | 2-wire or 3-wire sensor support; Cage clamp terminal |
| Dimensions (W × H × D) | 12 mm × 99 mm × 70 mm |
| Weight | 0.45kg |
| Operating Temperature | -20°C to +55°C |
The ST-1218 is widely used in:
Automotive assembly systems
Packaging machinery
Water and wastewater treatment plants
Material handling systems
Compact remote I/O panels
Its slim 12 mm form factor makes it particularly suitable for space-constrained DIN-rail installations, providing reliable status feedback for safety interlocks, sensor arrays, and operator interface signals.
Q1: Is the ST-1218 compatible with the newer PACSystems RSTi-EP series?
No. The ST-1218 belongs to the standard RSTi (FnIO S-Series) platform and uses different bus connectors compared to the RSTi-EP series. Always verify slice compatibility with your selected network adapter before ordering.
Q2: Does the module require a separate power supply for field sensors?
Yes. The ST-1218 requires 24V DC field power, supplied either via the network adapter or through a dedicated power feed module, to energize connected input devices.
