Global Start Disable For Channel - Siemens SINUMERIK 840D sl Function Manual

K1: Mode group, channel, program operation, reset response
9.4 Channel
PLC-controlled single-axis operations
An axis can also be controlled from the PLC instead of from a channel. For this purpose, the
PLC requests the axis from the NC via the NC/PLC interface:
DB31, ... DBX28.7 = 1 (PLC controls axis)
The following functions can be controlled from the PLC:
● Cancel axis/spindle sequence (equivalent to delete distance-to-go)
● Stop or interrupt axis/spindle
● Resume axis/spindle operation (continue the motion sequence)
● Reset axis/spindle to the initial state
For more information on the channel-specific signal exchange (PLC → NCK), see Section "P3:
Basic PLC program for SINUMERIK 840D sl (Page 821)."
The exact functionality of independent single-axis operations is described in:
References:
Function Manual, Extended Functions; Positioning Axes (P2)
9.4.1

Global start disable for channel

User/PLC
A global Start disable can be set for the selected channel via the HMI or from the PLC.
Function
When Start disable is set, no new program starts are accepted for the selected channel. Start
attempts are counted internally.
If a start is executed by the PLC before a global block disable is sent from the HMI to the NCK,
the program is not stopped by the Start disable and its status is transmitted to the HMI.
NC Start disable and global Start disable have the same effect on the internal counter for starts
that have been sent but not executed. (OPI variable startRejectCount).
Bypassing global Start disable
The interface signal:
DB21, ... DBX7.5 (PLC → NCK)
allows the PLC to temporarily bypass a global Start disable.
0:
1:
470
Global Start disable is effective
Global Start disable is temporarily canceled.
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions