User manual

Publication 1760-UM001A-EN-P
4-14 Drawing a Circuit Diagram with Pico
Function Relay Types
The function relays are used to simulate some of the devices used in conventional
relay control systems. Pico provides the following function relay types:
A function relay is started via its relay coil or by evaluating a parameter. It switches
the contact of the function relay according to its function and the set parameters.
Current actual values are erased if the power is turned off or if the unit is switched
to Stop mode.
Exception: Retentive coils retain their signal (see Chapter 7).
In timing and counter relays, it is also possible to change the switching behavior via
the coil function.
IMPORTANT
A latched relay is automatically switched off if the power fails or
if the device is in Stop mode. Exception: Retentive coils retain
signal 1 (see Retention on page 7-1).
Circuit diagram symbol Function relay type
Timing relay, on-delayed
Timing relay, on-delayed with random switching
Timing relay, off-delayed
Timing relay, off-delayed with random switching
Timing relay, single pulse
Timing relay, flashing
Counter relay, up/down counter
Time switch, weekday/time
(only in Pico models with real time clock)
Analog comparator relay
(only in Pico 24V dc models)
Text display (1760-L18AWA only)
DC
R