1. General Description

2. Product Identification

• Model: 172JNN21032

• Manufacturer: Schneider Electric

• Series: Modicon Momentum

• Type: Serial Link Option Adapter (Single‑Port RS‑232/RS‑485, RTC, DB9)

• Compatibility: All Modicon Momentum processors (171CCC/CCS series) and I/O bases (170XTS)

• Status: Discontinued (spare parts only; no direct replacement)

• Country of Origin: France

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

3. Technical Specifications

Communication Interface

• Port: 1 × DB9 (female), software‑selectable RS‑232 or RS‑485

• Protocol: Modbus RTU/ASCII (master/slave)

• Baud Rate: Up to 19.2 kbps

• Data Bits: 7/8; Parity: None/Even/Odd; Stop Bits: 1/2

• Isolation: RS‑485 isolated; RS‑232 non‑isolated

• Termination: RS‑485 software‑selectable 120 Ω

Real‑Time Clock (RTC)

• Precision: ±20 ppm

• Backup: 2/3AA lithium battery (5‑year life)

• Retention: RTC + memory during power loss

Electrical

• Supply: 5 V DC ±5% (from I/O base)

• Current: 700 mA @ 12 V DC

• Power Consumption: ≤ 3.5 W

Environmental

• Operating Temp: 0 °C to +60 °C (non‑condensing)

• Storage Temp: −40 °C to +85 °C

• Humidity: 5–95% RH (non‑condensing)

• Vibration: 0.75 mm, 1 g

• Shock: 15 g, 11 ms

• Altitude: Up to 2000 m (no derating)

• Protection: IP20 (IEC 529)

Physical

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

• Weight: 0.45 kg (1.0 lb)

• Material: Lexan (polycarbonate), conformal coating

• Mounting: Directly to Momentum I/O base

Indicators

• COMM (yellow): Blinks on serial activity; steady on fault

4. Key Features

• Dual‑Mode Serial Port: Software‑selectable RS‑232 (short‑range) / RS‑485 (long‑range, isolated)

• Modbus Master/Slave: RTU/ASCII support for flexible networking

• Integrated RTC: Battery‑backed clock for time‑stamping & scheduling

• Drop‑In Compatibility: Works with all Momentum processors/I/O bases

• Industrial Grade: Wide temp range, conformal coating, IP20

5. Applications

• Connect Momentum PLCs to HMIs, SCADA, modems, or serial devices

• Modbus RTU networks (RS‑485 for long distances; RS‑232 for local HMI)

• Legacy system integration (replace older serial adapters)

• Applications requiring time‑stamped data (via RTC)

• Small‑to‑medium industrial control panels

6. Installation Instructions

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

2. ESD Protection: Use anti‑static wristband.

3. Mounting: Align adapter with I/O base option slot; press firmly and tighten screws.

4. DB9 Wiring:

   • RS‑232: Connect TX/RX/GND to HMI/device.

   • RS‑485: Connect ±/GND to Modbus network; enable termination if last device.

5. Configuration:

   • Use Concept, Modsoft, or ProWORX 32 to select RS‑232/RS‑485, baud rate, parity, address.

   • Set RTC time via software.

6. Power Up: Verify COMM LED blinks on activity.

7. Compatibility

• Processors: 171CCC96030, 171CCS76000, 171CCS78000, etc.

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

• Software: Concept (IEC 61131‑3), Modsoft/ProWORX (LL984)

• Networks: Modbus RTU/ASCII (RS‑232/RS‑485)

8. Safety & Handling

• Installation by qualified personnel per local codes.

• Disconnect power before wiring/service.

• Avoid moisture, corrosive substances, direct sunlight.

• Use ESD protection to prevent static damage.

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

9. Maintenance & Troubleshooting

• Inspection: Quarterly check for loose screws, damaged DB9, LED status.

• Cleaning: Dry, lint‑free cloth only.

• Common Issues:

  • COMM Off: Check 5 V DC supply, seating, and configuration.

  • COMM Steady On: Serial fault; verify wiring, baud rate, parity.

  • No RTC Retention: Replace 2/3AA lithium battery.

  • RS‑485 Errors: Check termination, biasing resistors, and network grounding.

10. Replacement Information