Rockwell Automation 1760-xxxx Pico GFX-70 Controllers User Manual - Manual (Page 253)

Publication 1760-UM002B-EN-P - March 2005
Wiring with Pico GFX-70 4-143
Memory Requirement of the Timing Relay
The time relay function block requires 48 bytes of memory plus 4 bytes per
constant on the function block input.
Retention
Timing relays can be operated with retentive actual values. The number of
retentive timing relays can be selected in the SYSTEM
→ RETENTION menu.
If a timing relay is retentive, the actual value is retained when the operating
mode changes from RUN to STOP as well as when the power supply is
switched off.
If Pico GFX-70 is started in RUN mode, the timing relay operates with the
retentively saved actual value. The state of the trigger pulse must correspond
to the function of the timing relay.
1 signal when:
• on-delayed,
• single pulse,
• flashing.
0 status for off delayed.
Function of the Timing Relay Function Block
Timing relay, on-delayed with and without random switching
Random switching
The contact of the timing relay switches randomly within the setpoint value
range.