Siemens SINUMERIK 840C - Manual (Page 597)

09.95 8 PLC Machine Data (PLC MD)
8.2 PLC MD for the operating system (system data)
Example:
Value in PLC MD 11 = 71 when 1st machine control panel in PLC MD 128 is set to start
address 64.
I byte 0
:
:
:
I byte 71
I byte 72
:
:
I byte 127
Signals from the machine
Can be used as additional flag area
Max. 128 bytes on 135 WB
Reserved 14
Default value Lower input limit Upper input limit Units
0 – – –
DB 60
DW 14
Reserved 13 DB 60
DW 13
No. of wait cycles for assigned UI 17
Default value Lower input limit Upper input limit Units
1 0 10 –
DB 60
DW 17
This timeout is specified as the number of PLC cycles that are allowed to elapse before the
user interface (UI) is enabled, and applies to all user interfaces on a PLC. When the timeout
has expired, a negative acknowledgement is sent in response to a frame sent to the user
interface.
Default value: 1 i.e. the user interface must be free again after one PLC cycle
Max. input value: 10 i.e. the user interface must be free again after ten PLC cycles
See also Computer Link
No. of the UI during synchronization 18
Default value Lower input limit Upper input limit Units
0 0 31 –
DB 60
DW 18
A frame sent to the host computer can be output only via this user interface during
synchronization. See Computer Link.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 8–5
SINUMERIK 840C (IA)