Rockwell Automation T3464 ICS Regent AC Guarded Digital Output Module - Manual (Page 2)

AC Guarded Digital Output Module (T3464)
2
Industrial Control Services
replaced while the other Guarded module continues to control
the loads without interruption.
Module Operation
A block diagram of a typical AC Guarded digital output
module is shown in Figure 1.
The processor modules send triplicated write data commands
over the I/O Safetybus to the Guarded output module.
Onboard the Guarded output modules the triplicated data are
routed to two independent voter and microcomputer sections.
Each section independently votes the triplicated data to
generate a logic output drive signal. The two logic drive
signals are ANDed to control the output TRIAC.
Figure 1. Block Diagram of the AC Guarded Output Module.
The TRIAC will normally be energized only when both
microcomputer sections command the output to be on. If
either microcomputer section commands the output to be off,