Example 2: Muting - ABB AC500-S Safety User Manual

Safety application examples

Example 2: muting

Daisy chain The connection of the Ready output to an Activate input of the following FB ensures that no
from Activate irrelevant diagnostic information is generated if a device is disabled. The daisy chain from Acti-
and Ready vate and Ready avoid subsequent error messages of related function blocks.
Pre-evaluation If the target system supports an error signal, e.g., InputDevice_active, which represents the
of hardware status (active or not active) of the relevant safety device, this signal can be used to disable the
errors safety function blocks. This ensures no irrelevant diagnostic information is generated if a device
is disabled. If no such error signal is provided by the target system, a static TRUE signal must
be assigned to the Activate input.
Evaluation of The Error signals and DiagCodes of each safety function block are transferred to the non-safety
the diagnostic application. Diagnosis information might be processed and displayed by an attached visualiza-
information tion. There are different possibilities to realize the evaluation of the diagnostic information:
● Transfer these values into the visualization and realize the diagnostic evaluation in the visu-
alization.
● Realize the diagnostic evaluation in the non-safety logic and transfer the results to the visu-
alization.
Because of the various possibilities and the differences in the target system to realize diagnostic
processing, there is no special example showed here. Further diagnostic processing could be:
● Display of the error status for each safety function block
● Providing an error overview which is linked to function block specific error displays
● Detection and display of the last error of the used safety function blocks in the safety appli-
cation.
Information on
the used func-
tion block
parameters
Function block Input
SF_Equivalent_1 S_Discrepancy-
Time
SF_Emergency- S_StartReset
Stop_1
S_AutoReset
SF_SafeStop1_1 AxisID
MonitoringTime
SF_ESPE S_StartReset
S_AutoReset
7.3 Example 2: muting
This example describes the safety functions for the safeguarding of a production cell. Objects
are transferred through an entry gate, which is guarded by a light curtain. This light curtain can
be muted only for material transport into the cell. The cell may be entered by the operator
through a safety door. The process inside the cell is controlled by the functional application and
enabled by the safety circuit. In case of a safety demand or an error, all hazardous movements
are stopped in accordance with stop category 0.
346
Constant value Description
10 ms Maximum monitoring time for discrepancy status of
both inputs.
FALSE Manual reset when PES is started (warm or cold).
FALSE Manual reset when emergency stop button is
released.
AxisID_1 Drive address, supplier specific value
100 ms Time until the drive shall be stopped.
FALSE Manual reset when PES is started (warm or cold).
FALSE Manual reset after safety demand condition is
cleared.
3ADR025091M0208, 12, en_US 2020/06/19