Siemens SINUMERIK 840Di Function Manual page 1221

Signals PLC/Mode group
The operating mode signals set by the machine control panel or the HMI are transferred to
the operating mode group (BAG) of the NCK. On the 840D, these are valid for all NCK
channels. On 840D systems, several mode groups can optionally be defined in the NCK.
The mode group reports its current status to the PLC.
Fig. 2-6
Signals PLC/NCK channels
The signal groups below must be considered on the interface:
• Control/status signals
• Auxiliary/G functions
• Tool management signals
• NCK functions.
The control/status functions are transmitted cyclically at the start of OB1. The signals
entered in the channel-specific interface by the HMI (HMI signals are entered by the PLC
operating system) are also transferred at this time if they have been defined on the HMI
operator panel front, not on the MCP.
Auxiliary functions and G functions are entered in the interface data blocks in two ways.
First, they are entered with the change signals.
• M signals M00 - M99 (they are transferred from the NCK with extended address 0) are
• For G functions, only the groups selected via machine data are entered in the interface
• S values are also entered together with the related M signals (M03, M04, M05) in the
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
PLC/Mode group interface
also decoded and the associated interface bits set for the duration of one cycle.
data block.
spindle-specific interface. The axis-specific feedrates are also entered in the appropriate
axis-specific interface.
Detailed Description
2.6 Interface structure
2-27