621-9938
PublishedSerial I/O Module
HoneywellControl Systems (PLC & DCS)I/O ModuleIndustrial supply
Honeywell 621-9938 serial I/O module (SIOM), a dual-port communication card for Honeywell TDC 3000 and IPC 620/621 systems. Manages the serial I/O card file and interfaces with the 621-9939 serial link module.
Wholesale supply621-9938
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 / code621-9938
BrandHoneywell
Product lineIndustrial supply
CategoryControl Systems (PLC & DCS)
Product typeI/O Module
Technical data13 rows
Model621-9938
TypeSerial I/O Module
621-9938Serial I/O Module (SIOM) is a dual-port communication card used in Honeywell TDC 3000 and IPC 620/621 systems. It manages the serial I/O card file and interface
DiagnosticsFront-panel LEDs provide real-time status and fault indicators for easy monitoring
Dimensions33 × 23 × 13 cm (approx.)
Flexible DeploymentCan be used in both redundant and nonredundant applications
FunctionControls the serial I/O card file and links to 621-9939 SLM
Industrial ReliabilityBuilt for mission-critical Honeywell DCS environments
PortsDual communication ports for redundant serial I/O lines
Protocol SupportInterfaces with multiple serial-based field devices including sensors, actuators, HMIs, and printers
RedundancySupports redundant and nonredundant configurations
Redundant CommunicationDual-port design ensures high reliability in redundant serial I/O configurations
Seamless IntegrationWorks directly with 621-9939 Serial Link Module for processor communication
Reference numbers1 public
Honeywell621-9938