Rockwell Automation 1752-L24BBBE SmartGuard 600 Controllers User Manual - Manual (Page 241)

Rockwell Automation Publication 1752-UM001E-EN-P - June 2014 241
Function Blocks Command Reference Appendix D
• while the muting sensors are off, two muting sensors detect an object in the
correct sequence.
• while the muting sensors are off, the synchronization times of the two
muting sensors are within the normal range (not including the position
detection setting).
If an error occurs, an alarm output is generated. The sequence error signal goes on
if there is an invalid sequence. The synchronization error signal goes on if an
object cannot be detected within the synchronization time. The safety output
(Output Enable) goes off if the light curtain signal is inactive (no light) before
the controller transitions into the muting state.
Stop Conditions
If the following conditions are met while muting is in effect, the muting is
stopped, and the muting signal turns off:
• two or more sensors are not on.
• the maximum muting time has elapsed.
• a discrepancy error has occurred.
The safety output (Output Enable) goes off if muting is stopped and the light
curtain is obstructed.
Example: Parallel Muting with Two Sensors
In this example, two retro-reflective photoelectric sensors are set up as the muting
sensors with intersecting detection zones. The intersection of the two sensors
must be behind the light curtain. Use this configuration when the length of the
workpiece (L) is not fixed or long enough to activate sequential muting sensors.
IMPORTANT When the operating mode of the SmartGuard controller is changed from Idle to
Run mode, the input data from the slaves will be off until communication is
established. If slave input data is used for the AOPD Input, the Fault Present
and Sequence Error Outputs will turn on just after the operating mode is
changed to Run mode. When the AOPD Input turns on, the Fault Present output
will turn off. When the muting start condition is met, the Sequence Error
Output will turn off.