Chapter 7 Safety Function (Safe Torque Off, STO) ASDA A2-E
Revision April, 2015
7-7
AL500: STO Function is enabled
Causes
Checking Method
Corrective Actions
Safety function (STO) is
enabled
Safety function (STO) is enabled.
Please check the causes.
DI.ARST or write 0 into P0-01 or
0x6040.Fault Reset
AL502: STO_A lost (Signal is lost or error)
Causes
Checking Method
Corrective Actions
STO_A loses enable
signal or STO_A signal
does not synchronize
with STO_B signal for
more than 1 second.
Make sure the wiring of STO_A is
correct.
DI.ARST or write 0 into P0-01 or
0x6040.Fault Reset
AL502: STO_B lost (Signal is lost or error)
Causes
Checking Method
Corrective Actions
STO_B loses enable
signal or STO_A signal
does not synchronize
with STO_B signal for
more than 1 second.
Make sure the wiring of STO_B is
correct.
DI.ARST or write 0 into P0-01 or
0x6040.Fault Reset
AL503: STO_error
Causes
Checking Method
Corrective Actions
STO self-diagnostic error Check if the wiring between STO_A
and STO_B is correct.
STO circuit error. Please contact
with distributors.