Simodrive 611A - Siemens SINUMERIK 840C Installation Instructions Manual

12 Functional Descriptions
12.24.4 Travel to fixed stop with fixed clamping torque (torque limitation via terminal 96)
12.24.4.1
In this system, a fixed current limitation is specified via a resistor circuit (or via R12) in the
drive actuator. This current limit is then addressed by the control via a PLC output (which acts
on terminal 96 of the actuator) as soon as the function is activated. It can thus be ensured that
a fixed clamping torque is available at the axis.
Setpoints can be input via terminals 56/14 or 24/20.
Hardware connections:
NC
Position
actual
value
Speed
setpoint
PLC
Functional sequence with analog drives
The NC detects selection of function G221 (via G function or command channel) during block
processing and informs the PLC that the function has been selected via the interface signal
TRAVEL TO FIXED STOP ACTIVE.
The PLC must then activate the current limitation in the actuator (terminal 96) and transmit an
edge signal ACKNOWLEDGEMENT TRAVEL TO FIXED STOP ACTIVE to the NC.
The axis then approaches the target position at the programmed velocity.
As soon as the axis reaches the fixed stop, the following error increases. As a result of the
increase in the following error above the threshold set in NC MD 1280* or owing to the input
signal of a sensor (which is passed on to the PLC-NC interface), the control detects that the
fixed stop has been reached.
12–246
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SIMODRIVE 611A

Simodrive 611A
Speed Current
controller setpoint
limitation
56
14
20
24
96
ManualsBase.com
Current
controller
I
set
Actua-
tor
I
act
© Siemens AG 1992 All Rights Reserved
12.93
Drive
M
T P
Sensor
(option)
6FC5197- AA50
SINUMERIK 840C (IA)