2. Key Features

• Model: SCP451-11CPU (S1 suffix: standard)

• Core: 32‑bit RISC CPU @ 400 MHz

• Memory: 128 MB SDRAM / 16 MB Flash

• Processing Speed: 30 kHz loop execution

• Redundancy: Dual redundant support (hot‑swap)

• Communication: Ethernet 10/100 Mbps, RS‑232C, RS‑485

• Safety: IEC 61508 SIL 3 certified, fault‑tolerant design

• Input/Output: 16 analog in, 8 discrete in, 8 discrete out (base)

• Power: 24 V DC ±10%, 10 W typical

• Environ‑

  ment: –25 °C to 70 °C (F version); –20 °C to 40 °C (S version)

3. Safety Precautions

• Disconnect 24 V DC power before installation/wiring/maintenance.

• Install in a 19‑inch rack with keyed metal cabinet (safety/EMC compliance).

• Separate signal cables (Ethernet/RS‑485) from power cables to avoid interference.

• Only qualified safety/automation personnel may configure, program, or replace the module.

• Do not open or modify the module; no user‑serviceable parts inside.

• For safety‑critical applications, maintain redundant CPU configuration and regular testing.

4. Installation

4.1 Rack Mounting

1. Insert the SCP451-11CPU into a standard 19‑inch rack slot (height: 3U).

2. Align the module rails, push fully home, and tighten front panel screws.

3. Ensure adequate ventilation (≥50 mm clearance top/bottom).

4. For redundancy, install a second SCP451-11CPU in the adjacent slot.

4.2 Terminal Wiring

• PWR: 24 V DC ±10% (positive/ground)

• ETH1/ETH2: Ethernet (10/100 Mbps) for system communication

• RS‑232C: Serial port for local configuration

• RS‑485: Fieldbus/device communication

• I/O: Analog/digital I/O terminals (per system wiring diagram)

5. Front Panel Indicators

• PWR: Green = power ON; OFF = no power

• RUN: Green = CPU running normally; Blinking = self‑test/boot

• ERR: Red = fault (CPU, I/O, communication)

• RX/TX: Yellow = Ethernet/serial data activity

• RED: Green = redundant mode active; OFF = single CPU

6. Basic Operation

Power‑On & Self‑Test

1. Apply 24 V DC power.

2. The module runs self‑test (RUN blinks, ERR off).

3. After ~30 seconds, RUN steady green; system enters run mode.

Redundancy Setup (Dual CPU)

1. Install two SCP451-11CPU modules in adjacent slots.

2. Connect redundancy cable between the two CPUs.

3. Power on both modules; primary CPU controls, secondary syncs data.

4. If primary fails, secondary takes over automatically (hot‑swap).

Configuration (via RS‑232C/Ethernet)

1. Connect PC to RS‑232C or Ethernet port.

2. Use Yokogawa ProSafe‑RS engineering software.

3. Set IP address, redundancy mode, I/O parameters, and control logic.

4. Download configuration to CPU; save to non‑volatile memory.

7. Main Parameters

• CPU Speed: 400 MHz (fixed)

• Loop Time: 10–30,000 µs (configurable)

• Redundancy: Enable/Disable (default: Enable if dual CPU)

• IP Address: 192.168.1.10 (default)

• Subnet Mask: 255.255.255.0 (default)

• Gateway: 0.0.0.0 (default)

• Baud Rate (RS‑485): 9600 bps (default)

8. Fault & Error Codes

• E01: Power supply fault (check 24 V DC)

• E02: CPU overheating (check ventilation)

• E03: Communication loss (Ethernet/RS‑485 cable)

• E04: I/O module fault (check I/O wiring/modules)

• E05: Redundancy mismatch (check redundant CPU/cable)

• E06: Configuration error (re‑download valid config)

9. Specifications

• Model: SCP451-11CPU (S1)

• CPU: 32‑bit RISC @ 400 MHz

• Memory: 128 MB SDRAM, 16 MB Flash

• Power: 24 V DC ±10%, 10 W

• Operating Temp: –25 °C to 70 °C (F); –20 °C to 40 °C (S)

• Humidity: 10–90% RH (non‑condensing)

• Dimensions: 130 × 482 × 305 mm (3U, 19‑inch rack)

• Weight: Approx. 4.5 kg

• Certification: IEC 61508 SIL 3, CE, ATEX

10. Maintenance

• Keep the rack clean and dry; avoid dust/corrosive gas.

• Check power cables and redundancy cables monthly for tightness.

• Verify fan operation (F version) quarterly; replace if noisy.

• Back up CPU configuration every 6 months.

• Calibrate I/O channels annually for precision applications.