Schneider PC-E984-685

Product Name: Schneider Electric Modicon PC-E984-685 PLC CPU Module

Product Introduction: A classic Modicon 984-family processor module for 984-series racks, designed for large discrete and process automation with Modbus and Modbus Plus networking.

Description

Technical Specifications:

Architecture: 16-bit 984 CPU
Memory: 16 K words user program, 10 K words data, CMOS RAM with lithium battery backup
Scan Rate: 1 ms per 1 K instructions
I/O Capacity: 8192 discrete in + 8192 discrete out, 1088 register in/out, up to 5 local I/O racks, up to 31 remote I/O drops
Communication: 2 × Modbus (RS-232/RS-485, 19.2 kbit/s), 1 × Modbus Plus (peer-to-peer, 1 Mbit/s)
Power Supply: 24 V DC or 115/230 V AC 50/60 Hz (rack-powered variant dependent), ~1 A @ 24 V DC
Indicators: PWR, RUN, STOP, FAULT, COM
Mounting: 19-inch Modicon rack slot
Environment: 0…+60 °C, 5–95 % RH non-condensing
Certifications: UL 508, CSA, CE
Dimensions / Weight: approx. 220 × 110 × 270 mm, 2.0–2.5 kg

Functional Features: Memory protect switch; multitask (up to 63 tasks on related firmware); remote I/O scanner built in; Modbus Plus token passing.

Application Scenarios: Legacy pulp & paper lines, power plant auxiliary systems, metal rolling mills, oil & gas pump stations still running 984 architecture.

Installation Notes: Insert only with rack de-energized; verify jumper for 115 V vs 230 V AC if AC-powered backplane; Modbus Plus requires 120 Ω terminators and active tap.

Usage Precautions: Battery must be replaced every 5 years typical; removing battery with power off loses RTC and retentive data; do not mix with Quantum I/O racks directly.

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