Siemens Sinumerik 840D sl Function Manual page 62

Safety Functions integrated in the drive
4.3 Safe Torque Off (STO)
Restart after the Safe Torque Off function has been selected
1. Deselect the function in each monitoring channel via the input terminals.
2. Issue drive enable signals.
3. Cancel the power--on inhibit and power--up again.
-- 1/0 edge at input signal "ON/OFF1" (cancel "switching on inhibited")
-- 0/1 edge at input signal "ON/OFF1" (power--up drive)
Status for Safe Torque Off
The status of the Safe Torque Off (STO) function is displayed using the parameters
r9772, r9872, r9773 and r9774:
As an alternative, the status of the function can be displayed using the configurable
message N01620 (configured using p2118 and p2119).
Response times for the Safe Torque Off function
The following values can be specified for the response times when the function is
selected/deselected via the input terminals:
S Typical response time
2 x safety monitoring clock cycle CU (r9780) + input/output time sampling time
(p0799)
S Maximum response time that can occur when a fault develops:
4 x safety monitoring clock cycle CU (r9780) + input/output time sampling time
(p0799)
Examples, booksize
Assumption
Safety monitoring clock cycle CU (r9780) = 4 ms and
Inputs/outputs sampling time (r0799) = 4 ms
t = 2x r9780 (4 ms) + r0799 (4 ms) = 12 ms
R_type
t = 4x r9780 (4 ms) + r0799 (4 ms) = 20 ms
R_max
Parameter overview (see Chapter 8.2.1 "Overview of parameters")
S p0799 "CU inputs/outputs, sampling time"
S r9780 "SI monitoring clock cycle (Control Unit)"
S r9880 "SI monitoring clock cycle (Motor Module)"
Internal armature short- -circuit with the Safe Torque Off function
The function "internal armature short--circuit" can be configured together with the
"STO" function.
When simultaneously selected, the STO safety function has the priority. If the STO
function is initiated, then an activated internal armature short--circuit is disabled.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
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