1. General Description

2. Product Identification

• Model: 171CCS78000

• Manufacturer: Schneider Electric

• Series: Modicon Momentum

• Type: M1/M1E Processor Adapter (RS‑232 + isolated RS‑485, 20 MHz, LL984 only)

• Compatibility: All Modicon Momentum I/O bases (170XTS series)

• Status: Discontinued (spare parts only)

• Country of Origin: France

• Certifications: CE, UL, cUL, FM Class 1 Div 2, NEMA 250

3. Technical Specifications

Processor & Memory

• CPU: 20 MHz proprietary

• Flash: 256 KB (program storage)

• RAM: 64 KB (data + program execution)

• Program Memory (LL984): 2.4 K words

• Data Memory: 64 KB

• Scan Time: 1.0 ms per KB

• Word Length: 16‑bit

I/O Capacity

• Discrete I/O: 2048 inputs / 2048 outputs

• Register I/O: 2048 words in / 2048 words out

Communication Ports

• Port 1 – RS‑232 (non‑isolated): DB9, Modbus RTU/ASCII slave, up to 19.2 kbps

• Port 2 – RS‑485 (isolated): Terminal block, Modbus RTU/ASCII master/slave, up to 19.2 kbps

• Diagnostic LEDs: PWR (green), RUN (green), FLT (red), COMM1 (yellow), COMM2 (yellow)

Electrical

• Supply Voltage: 5 V DC ±5% (from Momentum I/O base)

• Power Consumption: ≤ 8 W

Environmental

• Operating Temperature: 0 °C to +40 °C (non‑condensing)

• Storage Temperature: −40 °C to +85 °C

• Humidity: 5–95% RH (non‑condensing)

• Vibration: 0.75 mm displacement, 1 g acceleration

• Shock: 15 g peak, 11 ms duration

• Altitude: Up to 2000 m (no derating)

Physical

• Dimensions (H × W × D): 25 mm × 125 mm × 183 mm

• Weight: 0.042 kg (0.09 lbs)

• Material: Lexan (industrial polycarbonate), conformal coating

4. Key Features

• Dual Independent Serial Ports: RS‑232 (slave) + isolated RS‑485 (master/slave)

• 20 MHz CPU: Reliable performance for LL984 logic

• 64 KB RAM / 256 KB Flash: Ample memory for small‑to‑medium programs

• Isolated RS‑485: Noise immunity for long‑distance Modbus networks

• LL984 Only: Optimized for legacy Modicon programming

• Drop‑In Fit: Compatible with all 170XTS I/O bases

5. Applications

• Small‑to‑medium standalone PLC control with Momentum I/O

• OEM machinery (conveyors, packaging, assembly lines)

• Systems requiring two Modbus ports (e.g., HMI on RS‑232, remote I/O on RS‑485)

• Legacy LL984 installations needing dual serial communication

• Retrofit projects replacing older Modicon controllers

• Industrial environments requiring isolated serial communication

6. Installation Instructions

1. Power Off: Disconnect power to the Momentum I/O base.

2. ESD Protection: Use anti‑static wristband when handling.

3. Mounting: Align adapter with I/O base connector; press firmly until seated. Tighten screws.

4. RS‑232 Wiring: Connect DB9 cable to HMI/SCADA; configure baud rate, data bits, parity, stop bits.

5. RS‑485 Wiring: Connect to Modbus network (+/−, GND); configure baud rate, parity, master/slave address.

6. Power Up: Apply 5 V DC. Check LEDs: PWR ON, RUN blinking (program execution), COMM1/COMM2 blinking (activity).

7. Programming: Download LL984 program via Modsoft ≥ V2.5 or ProWORX 32.

7. Compatibility

• I/O Bases: All 170XTS series discrete/analog I/O bases

• Software: LL984 only (Modsoft, ProWORX 32)

• Network: Modbus RTU/ASCII (RS‑232 slave; RS‑485 master/slave)

• Replacement: Superseded by 171CCC98030 (Ethernet + dual RS‑485, IEC 61131‑3 + LL984)

8. Safety & Handling

• Installation/maintenance by qualified personnel per local codes.

• Disconnect power before wiring/service to avoid electric shock.

• Avoid water, moisture, corrosive substances, direct sunlight.

• Use ESD protection to prevent static damage.

• Do not open casing; no user‑serviceable parts inside.

9. Maintenance & Troubleshooting

• Inspection: Quarterly check for cracks, loose screws, damaged connectors, LED status.

• Cleaning: Dry, lint‑free cloth only; no solvents/abrasives.

• Common Issues:

  • PWR Off: Check 5 V DC supply from I/O base.

  • FLT On: CPU fault; re‑seat adapter, reload program, check I/O base.

  • COMM1 No Response: Verify RS‑232 wiring, baud rate, parity, slave address.

  • COMM2 No Response: Verify RS‑485 wiring, baud rate, parity, master/slave address, termination.

  • No Program Execution: Ensure program downloaded, RUN mode active, no fatal faults.

10. Replacement Information

• 171CCC98030: Ethernet + dual RS‑485, IEC 61131‑3 + LL984, 1 MB Flash, 0–60 °C