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Product Overview

The ST-1218 (Part Number: ST-1218) is a high-density distributed I/O slice module belonging to the Emerson/GE RSTi series (originally manufactured by Crevis). This module is engineered for modern decentralized control architectures, providing 8 discrete input channels to interface field sensors with a centralized PLC or industrial PC via a network adapter.

Designed for industrial versatility, the ST-1218 (Model: ST-1218) supports both 12V and 24V DC logic levels, ensuring seamless compatibility with proximity switches, limit switches, and photoelectric sensors. Its compact "slice" form factor optimizes cabinet rail space, while the modular design allows for incremental scaling of I/O points. To ensure high system availability, the module incorporates photocoupler-based galvanic isolation, shielding the internal system bus from field-side electrical noise and surges common in high-EMI industrial environments.

Technical Specifications

The ST-1218 provides high-speed discrete signal processing with the following electrical characteristics:

  • Manufacturer: Crevis (for GE / Emerson)

  • Product Series: RSTi Distributed I/O

  • Model Number: ST-1218

  • Input Channels: 8 Digital Inputs (Sink/Source type)

  • Input Voltage: 12V DC / 24V DC Nominal

  • Voltage Range: 11V DC to 28.8V DC

  • Input Current: 4mA to 6mA per channel depending on voltage

  • ON Voltage Level: Greater than 11V DC

  • OFF Voltage Level: Less than 5V DC

  • Input Filter: 3.0ms typical (Software configurable via network adapter)

  • Isolation: Photocoupler isolation between I/O and Logic

  • Field Connection: Removable Spring-clamp terminal block

  • Status Indicators: 8 Green LED Input Status, 1 Red/Green Module Status LED

  • Bus Power Consumption: Max 30mA @ 5.0V DC

  • Operating Temperature: -20 °C to +60 °C

  • Storage Temperature: -40 °C to +85 °C

  • Dimensions: 12mm x 99mm x 70mm

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