78
Safe Torque Off (STO)
3ADW000488R0101 DCS880 Service manual e a
Evaluation of the graph and observations
Step Action
Comment
1
At the start of the procedure the monitor
value of 31.98 STO actual status must be
0xF.
2
After opening the STO circuit the value of
31.98 STO actual status must be 0xA.
3
After about 500 ms the value of 31.98 STO
actual status must be 0x2 or 0x8.
Shortly after the value of 31.98 STO actual
status must be 0x0.
4
Compare the values of 31.94 STO time 1
and 31.95 STO time 2. Their values must
be within 20 ms of each other and within
±70 ms of 500 ms.
5
Document and sign the STO revalidation test which verifies that the safety function is safe and
accepted for operation in the machine log book.
