Festo CAMC-G-S3 Manual page 86

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 SS2_SOS_RSF.
When the request of the SS2 function is terminated, the safety functions which follow directly are also
terminated automatically.
In addition, the SS2 function also provides 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 SS2 function generates the status messages:
– VOUT_SS2_SFR, safety function SS2 requested.
– VOUT_SS2_SSR, safe state SS2 reached
SS2 output signals
VOUT_SS2_SFR
VOUT_SS2_SSR
Tab. 2.43 SS2 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" (P0D.02), then the error [54-2] SS2_ERR is triggered.
The status "Safety condition violated" is not retracted by SS2, if the drive is back in the permitted range
after a temporary violation.
As soon as the drive has been braked to idle, the safety function SOS is requested, which has its own
error detection (position monitoring).
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.
86
Idle state Safety function requested / achieved
0 1
0 1 (delayed via P0D.01 + P0D.0A)
Festo – GDCP-CAMC-G-S3-EN – 1406NH – English