HEIDENHAIN MANUALplus 620 Technical Manual page 852

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6.16.8 Feed-rate enable

To move the axes, you must first enable the feed rate through the PLC. Until

"feed-rate enable" is set, the nominal velocity value zero is output. The status

display shows that the feed rate enable is set / not set.

You can set the feed rate enable for all axes of the NC channel or for specific

axes. The PLC run-time system combines PP_ChnFeedEnable and the

corresponding axis-dependent feed rate enable PP_AxFeedEnable with an

Feed-rate enable for all axes of an NC channel:

Set PP_ChnFeedEnable

Axis-specific feed-rate enable:

Reset PP_ChnFeedEnable

Set PP_AxFeedEnable

Feed-rate enable for axes that are not assigned to any NC channel, e.g. PLC

Set PP_AxFeedEnable

PLC operand / Description

PP_ChnFeedEnable

Feed-rate enable for all axes of the NC channel:

0: No feed-rate enable

1: Feed-rate enable

PP_AxFeedEnable

Axis-specific feed-rate enable

0: No feed-rate enable

1: Feed-rate enable

The PLC sets PP_ChnWorkFeedEnable if rapid traverse movements are

allowed. This marker is set, for example during a tool change or turret

actuation, in order to use the time for rapid-traverse movements. During the

first PLC scan after the compilation of the PLC program,

PP_ChnWorkFeedEnable is set to the value 1. This ensures that contouring

feed rates are also permitted if the PLC program does not activate the marker.

PLC operand / Description

PP_ChnWorkFeedEnable

Enables the contouring feed rate

0: Contouring feed rate not enabled, only G0

movements permitted (rapid traverse enable)

1: Contouring feed rate enabled

HEIDENHAIN Technical Manual MANUALplus 620