676
38 SAFETY DEVICES, SAFETY LABELS, AND CONSTANTS
38.1 Safety Devices
Safety user devices
This section describes the safety user devices.
Safety input (SA\X)
Safety inputs are used to give instructions or data to the SIL2 Process CPU with external devices such as emergency stop
buttons, safety plugs, door switches, and light curtains.
Safety output (SA\Y)
Safety outputs are used to output safety program control results to devices such as external relays and contactors.
When the status changes from STOP to RUN, the value immediately before the RUN state is retained, and the value is
updated at the moment safety cycle processing is executed for the first time after the status is changed to the RUN state.
Safety internal relay (SA\M)
This device is used as an auxiliary relay within the SIL2 Process CPU. The following operations for the SIL2 Process CPU
turn off all safety internal relays.
• Powering off and on
• Reset
Safety link relay (SA\B)
This device is used as a device when sending and receiving safety data between SIL2 Process CPUs over CC-Link IE Field
Network.
■Refreshing network modules using safety link relay
Data is sent and received between SIL2 Process CPUs. The safety communications send/receive device range is set in the
CC-Link IE Field Network safety communication settings. Locations that are not used for safety communications send/receive
devices can be used for other applications.
: Safety cycle processing start
(1) Turns on when safety communications are received.
(2) Turns off when safety communications are received.
(3) SA\Y0 turns on when SA\X0 turns on in the safety program.
(4) SA\Y0 turns off when the status of the CPU module is switched to STOP.
(5) The value is maintained when the status changes from STOP RUN.
(6) Turns on when a safety program is executed.
OFF
ON
(1)
(1)
(2)
(3) (4) (5) (6)
ON
ON
ON
OFF
Safety program
SA\X0
SA\Y0
RUN → STOP STOP → RUN
To Next Page
Loading...
