Festo CAMC-G-S3 Manual page 64

2 Product description of safety module CAMC-G-S3
The input logic for the STO function could look as followings in the "Request" tab in the
SafetyTool:
The STO function is requested via DIN40, if the mode switch DIN45 is active or via DIN41,
if the mode switch DIN45 is not active.
For each VIN... input, there is an OR gate with four inputs and upstream AND gates with
seven inputs. All the signals can be inverted.
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.
Safety function (right-hand section)
For as long as the safety function is requested, it safely monitors the status variables of the drive. It
contains the required logic and sequence functions for this, which can be parameterised.
The logic and sequence function are initialised on the rising edge of the request. For example, the start
values for slowdown ramps are calculated in this manner.
The safety function takes the current status of the drive (position, speed) into account and generates
various status signals and control signals. The most important functions are described in brief below:
– A parameter is used to define whether an automatic restart should occur after cancelling the re­
quest, or not.
– The stop functions have an additional control input to request the safety function. This input,
ERR_xxx_RSF, is supplied directly from the error management, as the stop function and error re­
sponse can be requested by the error management.
– Some safety functions can also be requested directly from other safety functions. For example, STO
is automatically activated at the end of the slowdown ramp of an SS1 function, but is also termin­
ated with it as well.
Each safety function provides at least the following output signals
– the status message VOUT_xxx_SFR, safety function xxx requested,
– the status signal VOUT_xxx_SSR, Safe State xxx Reached,
– at least one error message xxx_ERR if the safety condition is violated.
In addition, some safety functions provide additional control signals, e.g.
– for direct activation of the hardware, e.g. the driver supply or holding brake output for the safe
brake control,
– for the request of downstream safety functions, e.g. STO_SBC_RSF.
64 Festo – GDCP-CAMC-G-S3-EN – 1406NH – English