Siemens SINUMERIK 840C - Manual (Page 1022)

12.93 12 Functional Descriptions
12.24.4 Travel to fixed stop with fixed clamping torque (torque limitation via terminal 96)
The NC setpoint interface then outputs a voltage value according to the setting in NC MD
1144* Switchover current setpoint; however, the current limitation in the actuator becomes
operative as a result of the activation of terminal 96.
The NC outputs the interface signal FIXED STOP REACHED to the PLC.
The NC consequently deletes the remaining distance to go and switches the axis to follow-up
mode.
The PLC sends an edge signal ACKNOWLEDGEMENT FIXED STOP REACHED to the NC.
A block change is then performed. The current setpoint, and thus also the clamping torque,
remain applied.
12.24.4.2 SIMODRIVE 611A MSD or SIMODRIVE 660
With these systems, a torque limitation is entered in a free gear stage in the actuator. When
the function is selected, the PLC activates the free gear stage, thus making the torque
limitation operative. Setpoints must be input via terminals 56/14.
Hardware connections:
611A MSD, 660
NC
PLC
Outputs
Input
Sensor signal
for "Fixed stop
reached"
optional
E5 Torque-controlled
operation
E1 C-axis operation
117
118
119
24
8
56
14 Speed
setpoint 1
Speed
setpoint 2
Gear
stage
changeover
Po 39
1st torque
limitation
.
.
.
1
2
8
Measu-
ring
circuit
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–247
SINUMERIK 840C (IA)