621-9940C
PublishedSerial I/O Module
HoneywellControl Systems (PLC & DCS)I/O ModuleIndustrial supply
The Honeywell 621-9940C is a Serial I/O Module (SIOM) for Honeywell TPS and PlantScape distributed control systems, providing serial communication (RS-232/RS-485) between controllers and field devices. Hot-swappable; mounts in full-size (Slot N) or half (Slot H) I/O racks.
Wholesale supply621-9940C
No public pricingPriced per agreement on volume and market. Send your quantities — Kaysan replies with availability and wholesale terms.
Product identity6 fields
Item nameSerial I/O Module
Item number / code621-9940C
BrandHoneywell
Product lineIndustrial supply
CategoryControl Systems (PLC & DCS)
Product typeI/O Module
Technical data12 rows
Model621-9940C
TypeSerial I/O Module Supported Protocols
Compact DesignOptimized for Honeywell I/O racks, conserving panel space
ConditionNew or surplus stock
DIP SwitchesFour 8-position banks + one 4-position bank for address, fault response, and mode settings
Dimensions264 × 32 × 127 mm
Hot-SwappableEnables replacement without system shutdown, minimizing downtime
Industrial DurabilityEngineered for harsh environments with high reliability
LED DiagnosticsProvides immediate feedback for fault detection and troubleshooting
Module Density Options0, 8, 16, or 32 points per slot
Mounting SlotSlot N (full-size rack) or Slot H (half rack)
Multi-Protocol SupportCompatible with RS-232 and RS-485 for flexible field device integration
Reference numbers1 public
Honeywell621-9940C