SCA (Safe Cam)
SCA description for drive option Functional Safety 3.
Description
SCA is a pure monitoring function which has no fault reaction. Once configured, it stays activated monitoring whether the position stays within a position window. The parameter n_UL_SCA defines the upper limit and the parameter n_LL_SCA defines the lower limit of this window.
The SCA function returns a logical status, called InRange, which tells whether the position is currently located in the position window or not.
Number of Instances
Three instances per axis.
Function Input / Output Variables
Input
- Safe position: position signal from safe feedback
Outputs
- SCA InRange: logical status telling if the position is in the range defined by the SCA function
Activation
No activation source. Once configured in the safety parameters, it stays activated.
Related Parameters
Safety parameters
|
Name |
Variables |
Default |
Parameter |
|---|---|---|---|
|
Function Activation |
- |
0 (Never active) |
|
|
Position Upper Limit |
s_UL_SCA |
0 (Pos user units) |
|
|
Position Lower Limit |
s_LL_SCA |
0 (Pos user units) |
Diagnostic parameters
| Name |
Variables |
Default |
Parameter |
|---|---|---|---|
|
SCA In Range |
- |
- |
|
|
Function Internal Status |
- |
- |
Timing
Setup in WorkBench
Select the drive and open the Safety Parameterization view (see "Parameters Editor").
Choose the axis (1), category (2), SCA function (3) and the instance number (4).
Safety State / Status Signals
The signal AXIS#.SAFE.SCA_#.INRANGE can be monitored by safe digital outputs with OSSD pulses (see "OSSD"). The status signal must be mapped to the safe digital output. Two outputs can be combined to a dual channel output. For parameter description refer to Functional Safety Parameter Reference.
Safety Properties
Refer to (➜ # 1, Safety Properties Overview).
