Rockwell Automation 1760-xxxx Pico GFX-70 Controllers User Manual - Manual (Page 249)

Publication 1760-UM002B-EN-P - March 2005
Wiring with Pico GFX-70 4-139
Timing Relay
Pico GFX-70 provides 32 timing relays from T 01 to T 32.
A timing relay is used to change the switching duration and the make and
break times of a switching contact. The delay times can be configured between
5 ms and 99 h 59 min.
Wiring a Timing Relay
You integrate a timing relay into your circuit in the form of a contact and coil.
The function of the relay is defined via the parameter display. The relay is
started via the trigger coil T..EN and can be selectively reset via the reset coil
T..RE. The actual timeout running can be stopped via the third coil T..ST.
Figure 4.62 Pico GFX-70 circuit diagram with timing relay.
ATTENTION
The shorter the cycle time, the faster the control and
regulation process.
Set as small a value for the set cycle time as possible. The
processing of the function blocks, reading of the inputs and
writing of outputs is only carried out once every cycle.
Exception: All function blocks that are processed
irrespective of the controller.
IMPORTANT
To prevent unpredictable switching states, use each coil of a
relay once only in the circuit diagram.
I 01---------------------------[ T 02EN
I 02---------------------------[ T 02RE
T 02Q1-------------------------[ Q 01
I 03---------------------------[ T 02ST