Rockwell Automation 1794-L34 FlexLogix Controller System User Manual - Manual (Page 109)

Publication 1794-UM001G-EN-P - January 2007
FlexLogix Back-Up on DeviceNet 109
Setting the Heartbeat Constant
You can set the heartbeat constant with five rungs of ladder logic.
Figure shows rungs 0 & 1 and the message set-up used in rung 1. The
message in rung 1 uses the INT data type.
Rung 1 message configuration and communication tabs