Product Overview

Model Definition

• 07: Procontic 90/31 / AC31 series

• KR: CPU with relay outputs

• 91: High‑performance grade

• B: Revised/updated hardware version (vs. standard 07KR91)

Technical Specifications

• Part Number: GJR5250000R0353

• Power Supply: 24 VDC (18–30 VDC) or 115/230 VAC (model‑specific)

• User Memory: 28 kB Flash EPROM (30 kB physical)

• Onboard I/O:

  • Inputs: 20 × 24 VDC (sink/source)

  • Outputs: 12 × relay (NO), 10 A / 240 VAC

• High‑Speed Counter: 1 × 10 kHz input

• Communication:

  • COM1: RS‑232 (programming/ASCII)

  • COM2: RS‑485 (Modbus RTU / CS31 bus)

  • CS31 Bus: Up to 31 remote I/O modules

• Max Expansion: 744 DI / 496 DO / 96 AI / 48 AO

• Real‑Time Clock: Integrated (event timestamping)

• Operating Temperature: 0 °C to +55 °C

• Dimensions (W×H×D): 160 × 100 × 95 mm

• Weight: ~0.5–0.7 kg

• Certifications: CE, UL, CSA

Interface & Indicators

• LEDs: PWR, RUN, ERR, TX, RX (diagnostics)

• RS‑232: Programming, HMI, point‑to‑point

• RS‑485: Modbus RTU (master/slave), CS31 system bus

• Programming Software: 907 PC 331 / Control Builder AC31

Core Functions

1. Standalone Control: Ladder logic / structured text, PID control

2. Distributed I/O: CS31 bus master (31 slaves max)

3. Serial Communication: Modbus RTU, RCOM, ASCII protocols

4. High‑Speed Counting: 10 kHz input for pulse/encoder signals

5. Data Logging: RTC + non‑volatile memory, event timestamping

Applications

• Factory automation: Conveyors, assembly lines, packaging machines

• Process control: Water treatment, pumping stations, HVAC

• Building automation: Large HVAC, lighting, energy management

• System migration: Upgrade legacy Procontic CS31 installations

Installation & Maintenance

• Mounting: 35 mm DIN rail or panel mount

• Wiring: Shielded twisted pair for RS‑485/CS31

• Backup: Use 07LE90 memory module for program backup

• Maintenance: Annual program backup; periodic LED status check

• Protection: Reverse‑polarity protection on power terminals