Festo CAMC-G-S3 Manual page 79

2 Product description of safety module CAMC-G-S3
Each request of the safety function has priority over termination of the request.
This means: As long as one of the xxx_RSF (Request Safety Function) signals is pending, the safety
function cannot be terminated by an xxx_CSF (Clear Safety Function) signal.
The safety function directly activates the following safety functions:
– SOS via the signal SS1_STO_SFR.
– SBC via the signal SS1_SBC_SFR.
When the request for the SS1 function is terminated, the safety functions which follow directly are also
terminated automatically.
In addition, the SS1 function also supplies some control signals for activation of the basic unit:
– limits for speed in the basic unit, SPEED_LIMIT.
– a control signal to trigger the quick stop ramp in the basic unit (not shown in the block diagram).
In addition, the SS1 function generates the status signals:
– VOUT_SS1_SFR, safety function SS1 requested.
– VOUT_SS1_SSR, safe state SS1 reached
SS1 output signals
VOUT_SS1_SFR
VOUT_SS1_SSR
Tab. 2.37 SS1 output signals
Error detection
The safety function at regular intervals compares the current speed (ACTUAL_SPEED) with the calcu­
lated speed ramp. If the current speed is outside the permitted speed range for a parameterisable time
"Allowable time for limit violation" (P0C.02), then the error [54-4] SS1_ERR is triggered.
The status "Safety condition violated" is not taken back by SS1, if the drive is back in the permitted
range after a temporary violation.
If the safety condition is violated, EN 61800-5-2 requires "STO" as an error response.
However, in some applications, other error responses may be preferable, e. g. "STO +
SBC" è Section 2.8.2.
Festo – GDCP-CAMC-G-S3-EN – 1406NH – English
Idle state Safety function requested / achieved
0 1
0 1 (delayed via P0C.01 + P0C.0C + P0C.0B)
79