Siemens SINUMERIK 840D sl Function Manual page 459

The mode-group-specific NC/PLC interface essentially comprises the following interface
signals:
● Request signals PLC → NC
– Mode group reset
– Mode group stop axes plus spindles
– Mode group stop
– Mode changeover inhibit
– Mode: JOG, MDA, AUTOM.
– Single block: Type A, Type B
– Machine function REF, REPOS, TEACH IN, INC x
● Status signals NC → PLC
– Mode strobe: JOG, MDA, AUTOMATIC
– Machine function strobe: REF, REPOS, TEACH IN
– All channels in the reset state
– Mode group has been reset
– Mode group Ready
– Active mode: JOG, MDA, AUTOMATIC
– Active machine function: REF, REPOS, TEACH, INC x
Activated and non-activated channels, channel gaps
Activated channel
A channel with a mode group number ≠ 0 is an active channel.
Non-activated channel
A channel with a mode group number 0 is a non-activated channel. It does not take up any
memory internally in the control.
Channel gaps
A channel with a mode group number 0 is not only a non-activated channel. It is also a so-
called channel gap in the sequence of the channels.
The advantage of channel gaps is that the configuration data can be kept largely identical in
a series of similar machines. For the specific commissioning, only those channels are activated
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
K1: Mode group, channel, program operation, reset response
9.2 Mode group
459