621-0004

Product Overview

Honeywell 621-0004 is a Systems Diagnostic Module (SDM) designed as an external system monitor. 

Electrical Specifications

• Current draw @ 115 VAC: 500 mA

• Current draw @ 230 VAC: 80 mA

• Current draw @ 24 VAC/DC: 1 A

Functional Role

• Operation: Acts as watchdog timer, monitoring control and data lines

• Relay action: De‑energizes onboard relay upon malfunction

• Effect: Removes power from output modules to halt controlled machine or process

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