Festo CAMC-G-S3 Manual page 68

2 Product description of safety module CAMC-G-S3
If necessary, the safety function SBC can also be requested automatically with the signal
STO_SBC_RSF. In addition, it generates the status messages:
– VOUT_STO_SFR, safety function STO requested.
– VOUT_STO_SSR, safe state STO reached.
Error detection:
The supply of energy to the drive is reliably and immediately disconnected via the active safety function
STO "Safe Torque Off ". This is ensured by a two-channel design of the switch-off circuit, which is
checked continuously during operation. If a switch-off channel fails, an error message is generated. The
drive is switched off by the remaining channel.
The error message [54-5] STO_ERR "Safety condition STO violated" is output in the case of an error in
the STO function.
Process
The sequence of the STO safety function is shown in the following diagram:
Safety Function Request
SFR
n
P0A.02
n
Actual
STO
Fig. 2.15 Sequence diagram STO
Term/abbreviation
Safety Function Request SFR
Safe State Reached SSR
n
act
Tab. 2.28 Legend for Fig. 2.15
68
Safe State Reached
SSR
P0A.01
SBC
Explanation
Safety function request
Safe state reached
Actual speed
Festo – GDCP-CAMC-G-S3-EN – 1406NH – English
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