19.6.4 STO Function Diagnosis and Status Indication
The normal state is that the device run normally and the STO function is in
standby stage, if either of the input channels or both are de-energized, the STO
function is activated and the device will go to safe state, at this state, the device
shuts off the outputs and disables start-up, the device stop and no rotary field
to generate any torque at the motor.
Indica-
tion
STO event Description
Input channel logic
Channel 1 Channel 2
StO-A STO alarm
STO function is activated correctly in stop mode,
after re-energized input channels, the device
goes to normal state.
0 0
StO-r STO request
STO function is activated correctly in running
mode, after re-energized input channels and re-
set the device, the device goes to normal state.
0 0
StO-E STO error
STO function is activated incorrectly, it happens
if one channel is energized but the other is de-
energized.
1 0
0 1
Tab. 19-7: STO function diagnosis and status indication
● Hardware damage of the channel may also cause “StO-E” error.
● The safety integrity level would decrease if only one input channel
is used, please use two input channels.
EFC x610 Series Bosch Rexroth AG
Appendix
DOK-RCON03-EFC-X610***-IT05-EN-P
385/389
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