Siemens SINUMERIK 840C - Manual (Page 873)

12 Functional Descriptions 07.97
12.12.5 Influence of the modes on the path dimension function from the PLC
The path dimension is traversed if the disabling commands are cancelled and all required
enabling commands present.
The REPOS offset is updated whenever a program is interrupted in the AUTOMATIC mode
and a path dimension then traversed.
12.12.5.2 Path dimension from the PLC and MDA, TEACH IN and
AUTOMATIC modes
The following generally applies to the MDA, TEACH IN and AUTOMATIC modes
• If no program is running in the specified NC channel, then the path dimension is started
immediately after the command channel transfer. If a program is interrupted in the MDA,
TEACH IN or AUTOMATIC modes, not active or JOG, INC or REPOS activated, then the
control behaves in the same way as in INC mode (for example, no setpoint/actual value
difference is displayed).
• If a program is running in the specified NC channel, then the path dimension can be
started - depending on NC MD 5008.7 - either only in the NC stop state or when a read-in
disable is set. If a program is stopped in the MDA, TEACH IN or AUTOMATIC modes by a
read-in disable and a path dimension transferred from the PLC, then the control behaves in
the same way as in AUTOMATIC mode (the setpoint/actual value difference is displayed).
While the path dimension is being traversed, the interface signal ”Program in progress”
remains active (if the status displays are configured, then the appropriate icon is
displayed).
The following effects occur as a result of program influences and the corresponding machine
functions:
Block search: If block search is active, a path dimension cannot be traversed. The path
dimension function is not permitted and the request is acknowledged
negatively by the PLC.
Overstoring: If the path dimension function is active, overstoring cannot be activated
because NC start cannot be evaluated. If overstoring is active in the path
dimension channel, then the path dimension function cannot be activated
because the channel is occupied.
Single block: It is possible to start path dimension after program stop as a result of
single block in combination with read-in disable only.
Dry run feedrate: No effect
Note:
The conditions described apply only to the operating mode group in which the channel
selected for path dimension is situated.
Interface signals ”Program interrupted” and ”NC start possible” can be applied as the criterion
for NC channel in the stop state.
12–98 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)