Siemens SINUMERIK 840C Installation Instructions Manual page 615

09.95
6049, bit 2 = 0 PLC minimum cycle time switched on (default setting).
6049, bit 2 = 1 PLC minimum cycle time switched off, i.e. the PLC cycle time is derived
from the running time of the user program.
If the PLC minimum cycle time is switched off with PLC machine data
6049, bit 2, the user himself must maintain the VDI signals for at least
PLC MD
DB63
7
DW No.
6050
DL 25
OB 7 OB 6
Default value: 1111 1100
Bit 2-7 Bit = 0 The OB referred to is enabled for processing.
Bit = 1 The OB is disabled for processing and is not invoked by the system
program.
PLC MD
DB63
7
DW No.
6051
DR 25
Default value: 0000 0011
Bit 1 Bit = 0 The programmer displays 155U as CPU identifier
Bit = 1 The programmer displays 135 WB as CPU identifier
See Section 3
For OB 5, also see PLC MD 2
For OB 2, also see PLC MD 30, 6032 and 6055
Bit 0 Bit = 0 Level change possible after each STEP 5 statement (special mode).
Bit = 1 Level change (e.g. OB 6 interrupts OB 1) possible at block boundaries
only (same performance as 130 WB PLC in normal mode).
Note:
You must set the bit for "PLC mode" to 0 if OB 2 and OB 5 are to be invoked. If this
bit is "1", the OBs are not processed even if they have been loaded into the
programmable controller.
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
twice the IPO sampling time.
Bit No.
6 5 4
Disable
OB 5 OB 4
Bit No.
6 5 4
6FC5197- AA50
8 PLC Machine Data (PLC MD)
8.5 PLC MD for the operating system (system bits)
3 2 1
OB 3 OB 2
3 2 1
Program-
mer mode
0
0
Special
mode
8–23