Emerson EP-1218 RSTi-EP 8-Channel Digital Input Module
Manufacturer: Emerson
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Part Number: EP-1218
Condition：New with Original Package
Product Type: Digital Input Modules
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Emerson EP-1218 RSTi-EP Digital Input Module
The Emerson EP-1218, also cataloged as the EP-1218 Digital Input Module, operates as a dedicated hardware component for discrete 24 VDC field signal acquisition within PACSystems RSTi-EP remote I/O networks. The module processes binary inputs from limit switches, proximity sensors, and pushbuttons, executing signal conversion into digital data for higher-level controllers. Featuring an 11.5 mm slice footprint, the unit accommodates up to 64 module slices per network drop to scale input density across localized field enclosures.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | EP-1218 |
| Brand | Emerson |
| Origin | Not Specified |
| Weight | Not Specified |
| Dimensions | 11.5 mm slice width |
| Operating Temp | -25 deg C to +60 deg C |
| Power Consumption | Isys: 8 mA; Iin: 30 mA |
| Supply Voltage Range | 20.4 to 28.8 VDC |
| Input Channels | 8 positive-logic channels |
| Nominal Input Voltage | 24 VDC |
| Input Thresholds | ON > 11 VDC; OFF < 5 VDC |
| Response Time | 0.3 ms (configurable) |
| System Density | Up to 64 modules or 1024 I/O points per drop |
| Mounting | 35 mm DIN-rail slice mount |
| Certifications | UL 508, CSA C22.2, Class 1 Div 2 Groups A-D, ISA 12.12.01:2007 |
Channel-to-System Isolation and High-Density Signal Processing
The EP-1218 module incorporates galvanic isolation between field-side 24 VDC input circuits and the internal system backplane bus. This electrical separation blocks common-mode voltage transients and ground loops from propagating to the communication interface. Operating within the PACSystems RSTi-EP backplane ecosystem, the module delivers configurable 0.3 ms signal detection latencies while supporting channel status diagnostics to enable deterministic data transfer across high-density I/O configurations.
Frequently Asked Questions
Q: What are the input switching voltage thresholds for the EP-1218 module?
A: The input channels recognize a logic state of ON when voltage exceeds 11 VDC and a logic state of OFF when voltage drops below 5 VDC, operating across a rated supply window of 20.4 to 28.8 VDC.
Q: What system current does the module draw from the backplane?
A: The EP-1218 draws a system current (Isys) of 8 mA from the internal bus, while requiring an input circuit current (Iin) of 30 mA from the field supply.
Q: What are the installation restrictions when operating in Class 1 Div 2 hazardous locations?
A: The module must be installed inside an enclosure providing a minimum protection rating of IP54. Field wiring must not be disconnected while circuits are energized unless the area is verified to be non-hazardous.
Field Installation Guidelines
Mount the EP-1218 module onto a standard 35 mm DIN rail by snapping the bottom locking mechanism onto the rail profile. Ensure adjacent slice modules align precisely with the side bus connectors to maintain backplane continuity. Route 24 VDC field signal cables through dedicated wire channels, maintaining physical separation from high-voltage AC lines to prevent capacitive coupling. Ground the DIN rail structure to the central protective earth (PE) terminal using a low-impedance copper conductor. For hazardous area applications, verify that all external connections conform to Class 1 Div 2 wiring methods before applying system power.