172JNN21032

The Schneider Electric 172JNN21032, also cataloged as the 172JNN21032 Serial Link Option Adaptor, operates as a dedicated hardware component for single-port RS232 or RS485 serial communication processing within Modicon Momentum automation platform systems.

Hardware Specifications

Parameter	Specification
Model	172JNN21032
Brand	Schneider Electric
Origin	France / Global Operations
Weight	85.05 g
Dimensions	143.1 mm x 25 mm x 60.06 mm
Operating Temp	0 to 60 deg C
Power Consumption	700 mA at 12 VDC
Supply Voltage	5 VDC (+/- 5%) via I/O base
Communication Ports	1 port (RS232 or RS485 selectable)
Physical Interface	1 x 9-pin D-shell connector
Real-Time Clock Accuracy	+/- 13 s/day drift
Backup Battery Type	Lithium battery, 2/3 AA size (5-year life)
Protection Rating	IP20 conforming to IEC 529
Protective Coating	Conformal coating Humiseal 1A33
Dielectric Strength	500 VDC
Enclosure Material	Lexan

Deterministic Backplane Communication & Fieldbus Dynamics

The 172JNN21032 handles serial payload translation across deterministic backplane networks, providing a direct interface between the Modicon Momentum I/O base and serial field infrastructure. Backplane bus communication velocity and protocol translation latencies are maintained through hardware-level buffer management. The module supports point-to-point RS232 signaling or multi-drop RS485 topology options via its DB9 interface. Integrated real-time clock functionality relies on a dedicated lithium backup source, maintaining system timestamps during primary power dropouts without backplane bus degradation.

Frequently Asked Questions

Q: How does the 172JNN21032 draw internal operational power?

A: The adapter receives its primary 5 VDC logic power directly through the underlying Modicon Momentum I/O base bus connection, drawing up to 700 mA at 12 VDC during active operational cycles.

Q: What happens to clock tracking when the base power is removed?

A: An internal 2/3 AA lithium battery maintains real-time clock operation during power outages, providing up to 30 days of autonomous clock retention after a battery-low state is flagged at 40 deg C.

Field Installation Guidelines

Mount the option adapter directly onto the designated Modicon Momentum base unit slot. Ensure field wiring connected to the 9-pin D-shell interface adheres to RS232 or RS485 differential distance limitations. Standard industrial shielding procedures require grounding the cable braid to the DB9 connector shell to prevent EMI interference. Maintain minimum clearance around the module assembly to allow passive thermal dissipation across the 0 to 60 deg C operating range.

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