Siemens SIRIUS 3RK3 - Two-Hand Operation

7.3.3.8 Two-hand operation
The table below lists all the messages and corresponding LED responses to the "two-hand
operation" function element.
Message Meaning LED response
SF-LED on central unit Input LEDs on central unit
or expansion module
Discrepancy condition
violated
is set if:
• After the discrepancy time has
elapsed, the signal states at the
inputs monitored are di󹪜erent
within one or between to two
pushbuttons.
• The signal states of the inputs
monitored had not all previously
been reset simultaneously to the
value "0" when they are set to "1"
󹪞ashes red The IN LEDs of the sensor are
󹪞ashing green.
Cross-circuit at input x A cross-circuit was detected at input x. red The IN LEDs of the sensor are
󹪞ashing green.
Start condition not ful󹪝l‐
led
is set if:
• If both pushbuttons were not
pressed "synchronously," that is,
they were pressed with a time o󹪜‐
set greater than 0.5 s
• A discrepancy condition violation
is present
• The value "1" is not present simul‐
taneously at IN1 ... 2 / 4
• A cross-circuit is present
‑ ‑
Pushbutton stuck
(not in the case of 3RK3
Basic)
The pushbutton is stuck. 󹪞ashes red The IN LEDs of the sensor are
󹪞ashing green.
Do not release both push‐
buttons simultaneously
(not in the case of 3RK3
Basic)
The two pushbuttons were not re‐
leased simultaneously.
󹪞ashes red The IN LEDs of the sensor are
󹪞ashing green.
Diagnostics / service
7.3 Diagnostics with LEDs
SIRIUS 3RK3 Modular Safety System
278 Equipment Manual, 07/2020, NEB926253002000/RS-AC/006