Programming techniques chapter 5 – Rockwell Automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CONC(OR.DU1 User Manual
Page 96
Programming Techniques
Chapter 5
5-15
Figure 5.6
Program Compare Status Information for the Memory Communication
Module
Unused value (always 0)
User program section of
PLCĆ3 memory (always 4)
Ladder program section:
1 for main program
2 for subroutine
3 for fault routine
Current operating context number
(1 to 15)
17
16
15
14
13 12
11
10
07
06
05 04
03
02
01
00
17
16
15
14
13 12
11
10
07
06
05 04
03
02
01
00
Status File 4, Word 1 in the Data Table
Status File 4, Word 2 in the Data Table
This word stores the rung number where the
memory communication module detected the
miscomparison
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Word 2 gives you the rung number where the miscomparison occurred. For
example, if word 2 contained the value 12 then, the miscomparison is
located on rung 12 of the ladder logic program section designated in status
file 4, word 0.
1775ĆMX Module System ID
A system ID is automatically assigned to each 1775-MX module and
stored in S4:3 (status file 4, word 3). The MCM OPERATION menu in
LIST also displays this system ID. This ID is dependent on the physical
location (chassis number and slot number) of scanner #1.
17
16
15
14
13 12
11
10
07
06
05 04
03
02
01
00
Status File 4, Word 1 in the Data Table
Number of chassis slot
in which Scanner #1
resides (1 thru 6)
Number of chassis
in which Scanner #1
resides (0 thru 3)
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