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YOKOGAWA PSCCM24AAN
Product Introduction:
The PSCCM24AAN is a combined power supply and communication module for the Yokogawa FA-M3 and F3 Series Programmable Logic Controllers. This module provides 24 V DC regulated power to the PLC backplane and I/O modules while also serving as a communication gateway for programming and data exchange. The “24” indicates 24 V DC output, “AA” specifies the communication protocol variant (typically Modbus RTU/TCP or proprietary), and “N” denotes the noise filter configuration.
Detailed content
Technical Specifications:
- Input Voltage: 100 to 240 V AC, 50/60 Hz (universal)
- Output Voltage: 24 V DC (regulated, ±2% tolerance)
- Output Current: 3 A maximum (72 W total)
- Communication: RS-232C, RS-485 (Modbus RTU master/slave), Ethernet (10/100 Base-TX, Modbus TCP)
- Protocol Support: Modbus RTU, Modbus TCP, Yokogawa F-Link (proprietary)
- Isolation: 1500 V DC between power section and communication section
- Operating Temperature: 0°C to +55°C
- Protection: Overcurrent (3.5 A fuse), overvoltage, reverse polarity, short-circuit
- MTBF: ≥100,000 hours
- Compliance: UL 508, CE, CSA C22.2 No. 142
Functional Features:
- Dual function: Provides backplane power AND communication interface — eliminates need for separate communication modules
- Web server built-in — allows remote monitoring and parameter changes via standard web browser
- E-mail alarm notification — configurable alarm-triggered e-mail with data attachment
- Firmware update via Ethernet or USB — no need to remove module from rack
- LED indicators: Power OK (green), Communication (yellow blinking), Fault (red)
Performance Parameters:
| Parameter | Value |
|---|---|
| Output Ripple | ≤100 mV peak-to-peak |
| Line Regulation | ±1% (100–240 V AC) |
| Load Regulation | ±2% (0 to 3 A) |
| RS-485 Speed | Up to 115.2 kbps |
| Ethernet Speed | 10/100 Mbps auto-negotiation |
| EMC Compliance | IEC 61131-2 (emission and immunity) |
Material Composition:
- Housing: Flame-retardant ABS plastic (UL 94 V-0)
- PCB: FR-4, 6-layer, with conformal coating
- Terminals: Phoenix Contact-compatible screw terminals, 4 mm pitch
- Ethernet Connector: RJ-45 with integrated magnetics (isolation transformer)
- Fuse: 3.5 A slow-blow, 250 V AC (replaceable)
Structural Characteristics:
- Form Factor: FA-M3 / F3 standard module
- Dimensions: 98 mm (W) × 130 mm (H) × 90 mm (D)
- Weight: Approximately 0.5 kg
- Mounting: DIN rail or backplane insertion in FA-M3 / F3 rack
- Connector (backplane side): FA-M3 / F3 standard 48-pin connector
Working Principle:
The module accepts 100–240 V AC input, rectifies it via a bridge rectifier and PFC stage, then uses a high-frequency isolated flyback DC-DC converter (typically 200 kHz PWM) to generate regulated 24 V DC for the PLC backplane. The communication section uses a dedicated Ethernet controller ASIC with an integrated TCP/IP stack and Modbus engine, connected to the PLC CPU via the backplane bus. The RS-485 transceiver is galvanically isolated from the power section using a digital isolator IC.
Key Advantages:
- Combined power + communication in one module — reduces rack space by 1 slot
- Built-in web server — enables remote maintenance without specialized software
- E-mail alarm — proactive notification before operator reaches control room
- 3 A output capacity — sufficient to power CPU + up to 8 I/O modules
Applicable Industries:
- Oil and gas SCADA (remote well monitoring)
- Water treatment (remote pump station control)
- Manufacturing (distributed I/O with Ethernet backbone)
- Building automation (BACnet/Modbus integration)
- Renewable energy (solar/wind farm remote monitoring)
Installation Requirements:
- Install in FA-M3 or F3 PLC rack (slot 0 or dedicated power/comm slot)
- Connect AC input to dedicated circuit breaker (rated 5 A, C-curve)
- Connect Ethernet cable to managed switch (Cat 5e or better, max 100 m)
- Bond chassis ground to plant earth ground (< 4 Ω impedance)
- Configure IP address, subnet mask, and gateway in F3/FA-M3 engineering software
Usage Precautions:
- Do not exceed 3 A total output current — fuse will blow, module will shut down
- Use shielded Cat 5e/Cat 6 cable for Ethernet in electrically noisy environments
- Set unique IP addresses for each PSCCM24AAN on the same network segment
- Update firmware only from Yokogawa-approved sources — corrupted firmware will brick the module
- Replace the 3.5 A fuse only with the exact same rating (250 V AC, slow-blow)
