172PNN21022

Configured for fieldbus network communication expansion in Modicon Momentum automation platform systems, the Schneider Electric 172PNN21022 (172PNN21022 Modbus Plus Option Adaptor) provides direct physical/electrical execution. It serves as a single-port communication interface that snaps onto a Momentum I/O base to provide high-speed data exchange across Modbus Plus architecture.

Hardware Specifications

Parameter	Specification
Model	172PNN21022
Brand	Schneider Electric
Origin	FR
Weight	85.05 g
Dimensions	143.1 mm x 25.0 mm x 60.06 mm
Operating Temp	0 to 60 deg C
Power Consumption	200 mA at 24 VDC (<= 350 mA peak)
Rated Supply Voltage	5 VDC (+/- 5 percent tolerance via I/O base)
Communication Ports	1 x Modbus Plus (9-pin D-shell)
Battery Type	2/3 AA Lithium (5-year life, < 30-day backup after low-battery indicator)
Enclosure Material	Lexan
IP Protection Rating	IP20 conforming to IEC 529
Clock Drift	+/- 13 s/day accuracy
Dielectric Strength	500 VDC

Deterministic Network Isolation & Backplane Performance

The module connects directly via the Momentum backplane bus, drawing its logic voltage supply through the underlying I/O base. Signal paths maintain deterministic network communications across Modbus Plus topology while ensuring I/O density scaling without introducing localized processing delays. Electrical isolation characteristics include a dielectric rating of 500 VDC and electrostatic discharge resistance of 4 kV via contact and 8 kV via air per IEC 801-2 standards. Electromagnetic immunity is validated up to 10 V/m across the 80 MHz to 1000 MHz spectrum to prevent data corruption during transient industrial noise spikes.

Frequently Asked Questions

Q: How is the primary logic power provided to the module?

A: The option adaptor draws its internal 5 VDC (+/- 5 percent) operating voltage directly from the attached Modicon Momentum I/O base structure via the backplane interface, consuming up to 350 mA.

Q: What action is required when the local low-battery condition indicator activates?

A: The internal 2/3 AA lithium battery must be replaced within 30 days at 40 deg C ambient conditions to avoid loss of real-time clock synchronization and retentive address configuration during power interruption.

Q: Can node addressing be configured dynamically via software?

A: No, the Modbus Plus node address must be set manually using the physical hardware DIP switches located on the unit prior to applying system power.

Field Installation Guidelines

• Mechanical Coupling: Align the option adaptor straight over the mounting slot of the target Modicon Momentum I/O base and apply even downward pressure until the retention snaps engage firmly. Ensure power to the base is disconnected prior to installation.
• Network Wiring: Connect the Modbus Plus drop cable using a shielded 9-pin D-shell connector. Tighten the connector jack screws to a torque limit of 0.4 Nm to ensure continuous shield grounding and mechanical stability against field vibration.
• Shield Grounding: Verify that the Modbus Plus cable shield is grounded at designated points along the trunk line to maintain continuous immunity against high-frequency electromagnetic interference.
• Environmental Limits: Install inside an enclosure offering a minimum IP54 protection level when deployed in industrial environments containing conductive dust, moisture, or chemical vapors. Maintain at least 25 mm of free air space surrounding the housing for adequate thermal dissipation up to the 60 deg C operational limit.

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