990NAA26320

The Schneider Electric 990NAA26320, also cataloged as the 990NAA26320 Connection Cordset, operates as a dedicated hardware component for RS232 point-to-point serial communication between a PC terminal and a Unity processor within Modicon Quantum and Premium automation platforms.

Hardware Specifications

Parameter	Specification
Model	990NAA26320
Brand	Schneider Electric
Origin	France
Net Weight	0.3 kg
Package Dimensions	25.0 cm x 19.0 cm x 3.0 cm
Operating Temp	0 to 60 deg C
Power Consumption	Passive (no external supply required)
Accessory Category	Connection accessories
Accessory Type	Connecting cable
Cable Length	3.7 m
Electrical Connection PC Side	1x SUB-D 9 connector (RS232)
Electrical Connection Processor Side	1x SUB-D 9 connector
System Compatibility	Modicon Premium, Modicon Quantum, Harmony HMI GTO
Processor Compatibility	140CPU31110, 140CPU43412A, 140CPU43412U, 140CPU53414A, 140CPU53414B

Modicon Backplane & Communication Execution

The 990NAA26320 cordset maintains point-to-point RS232 signal integrity during program upload, download, and online diagnostics across Modicon Quantum and Premium processor serial ports. Designed to operate alongside backplane bus communication velocity specifications, the physical connection avoids frame dropouts by maintaining stable pinout assignment and shielding against electromagnetic interference (EMI) typical in high-density I/O cabinet environments.

Frequently Asked Questions

Q: Does the 990NAA26320 cable require external power or driver installation?

A: No. The cable is a passive RS232 physical media connection. Power is not drawn from the host PC or PLC, and communication parameters are dictated by the host PC serial port (COM port) settings and Unity Pro software configuration.

Q: Can the 990NAA26320 be hot-plugged into an active Modicon Quantum CPU?

A: Yes, inserting or removing the SUB-D 9 RS232 connector does not interrupt CPU backplane processing or execution of the control logic program. However, active online monitoring sessions will drop and must be re-established in the software environment.

Field Installation Guidelines

• Cable Strain Relief: Ensure the SUB-D 9 mechanical locking screws are fully tightened to the serial port interface on both the processor and the programming device to prevent accidental disconnection or pin damage during field operation.
• Shielding & Grounding: Route the 3.7 m cable away from high-voltage AC lines, variable frequency drives (VFDs), and heavy inductive loads to prevent data corruption during program transfers. Maintain proper enclosure bonding to industrial ground.
• Bend Radius Constraints: Observe a minimum cable bend radius of 50 mm during installation inside wiring ducts or conduit to prevent internal conductor fatigue and shield breakdown.

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