ABB CL Series Applications Manual page 93

Wiring with the logic relay
I1-I2----SQ1
I2-------RQ1
90
Latching relay
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.
on
S
on
R
on
Figure 44: Latching relay signal diagram
• Range A: The set coil and the reset coil are triggered at different
times
• Range B: Reset coil is triggered at the same time as the set coil
• Range C: Power supply switched off
Display in the logic relay:
• Q output relays:
(depending on type)
• M markers:
• (Text) D function relays:
• S relays:
Use each of the two relay functions
If both coils are triggered at the same time, priority is given
to the coil further down in the circuit diagram.This is shown
in the above signal diagram in section B.
h 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 (a section "Retention (non-volatile
data storage)", Page 221).
A
SQ1 SQ8 RQ1
to ,
SM1 SM16 RM1
to , to
SD1 SD8
to
SS1 SS8
to ,
S
and
1SVC 440 795 M0100
B C
RQ8
to
RM16
RD1 RD8
, to
RS1 RS8
to
R
once only per relay.
: