Siemens SINUMERIK 840C - Manual (Page 602)

8 PLC Machine Data (PLC MD) 09.95
8.2 PLC MD for the operating system (system data)
Byte no. of 2nd alarm byte 125
Default value Lower input limit Upper input limit Units
- 1 - 1
127 (SW 4 and
higher)
–
DB 60
DW 125
Byte no. of 1st alarm byte 124 DB 60
DW 124
Byte no. of 3rd alarm byte 126
DB 60
DW 126
Byte no. of 4th alarm byte 127 DB 60
DW 127
This PLC MD can be used to define as many as 4 input bytes as alarm bytes. The PLC
software scans these bytes for changes every 10 ms. Enter - 1 for input bytes that are not to
serve as alarm bytes.
The PLC outputs an error message and goes to STOP if illegal values are detected on a cold
restart.
If enabled in PLC MD 6050, bit 3 (bit 3 = 0), OB 3 is invoked when an alarm is generated.
Address 1st machine control panel 128
Default value Lower input limit Upper input limit Units
64 0
127 (SW 4 and
higher)
–
DB 60
DW 128
Address 2nd machine control panel 129
Default value Lower input limit Upper input limit Units
72 0
127 (SW 4 and
higher)
–
DB 60
DW 129
These PLC MD specify the start address (byte) for the machine control panels.
Eight bytes are required for each control panel. The inputs and outputs for each control panel
have the same address numbers.
8–10 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)