Siemens SINUMERIK 840C Installation Instructions Manual page 1024

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Hardware connections:

Functional sequence

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.

The NC setpoint interface then begins to output the current setpoint defined in NC MD 1144*.

The NC outputs the interface signal FIXED STOP REACHED to the PLC.

The PLC then activates terminal 22 of the actuator, thus effecting a switchover from speed-

controlled to current-controlled operation. After a time period of > 10 ms, the PLC switches off

the current limitation (terminal 96). In addition, the PLC also sends an edge signal

ACKNOWLEDGEMENT FIXED STOP REACHED to the NC.

The NC subsequently deletes the remaining distance to go and switches the axis to follow-up

The axis setpoint output now outputs the current setpoint in accordance with the specified

torque (SD 320*).

A block change is then performed. The current setpoint, and thus also the clamping torque,

remain applied.

SINUMERIK 840C (IA)

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12 Functional Descriptions

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