Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 78)

Publication 1760-UM001D-EN-P - September 2005
4-18 Draw a Circuit Diagram with Pico
A coil automatically turns off if the power fails or if Pico is in Stop
mode.
Exception: Retentive coils retain signal 1 (see Chapter 7).
Latching Relay
Instruction Type Representation in Pico
Output Relay Q
Q1… Q8 (depending on type)
Marker Relay M
M1… M16
Text Display Relay D
D1… D8 (1760-L18xxx)
Expansion or Marker Relay
S1… S8 (1760-L18xxx)
Instruction Type Representation in Pico
Output Relay Q SQ1…SQ8, RQ1…RQ8 (depending on type)
Marker Relay M SM1…SM16, RM1…RM16
Text Display Relays D SD1…SD8, RD1…RD8 (1760-L18xxx)
Expansion or Marker Relay SS1…SS8, RS1…RS8 (1760-L18xxx)
S
R
A B C
The ’latch’ and ’unlatch’ relay functions are used in
pairs. The relay picks up when latched and remains
in this state until it is reset by the ’unlatch’
function.
Signal Diagram:
Set
Reset
Output
On
On
On
A - The Set coil and the Reset coil are triggered at different times.
B - Reset coil is triggered at the same time as the Set coil.
C - Power supply switched off.