Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 128)

Diagnostics Methods
Chapter 7
7-16
Table 7.H
Data Sent in Response to a Diagnostic Status Command
Byte: Bit: Description:
1 Operating status of PLC-3 processor
0-1 00 = Program mode
01 = Test mode
10 = Run mode
2 Not used
3 0 = Normal
1 = Major processor fault
4 0 = Normal
1 = Shutdown request
5 0 = Normal
1 = Shutdown in effect
6Ć7 Not used
2 Type of station interface and processor
0Ć3 6 = scanner
4Ć7 4 = PLC-3 processor
3 all Current context stored in bits 4 thru 7
4 all Thumbwheel
5Ć6 all Mode control word
The extended address of the mode control word is E0.0.0.8
7Ć8 all Starting byte address of the diagnostic counters.
9 Series and revision number of the module.
Even though the scanners are series A, they appear as series E modules
0Ć3 0 = Revision A scanner
1 = Revision B scanner
etc.
4Ć7 0 = Series A 1 = Series B
etc.
10 Type of channel communications
0Ć1 0 = Inactive
1 = DH
2 = DH+
3 = other
2Ć3 0 = A/G or earlier S5 or SR5
1 = A/H or later S5
2 = A/H or later SR5
3 = unused
4Ć7 unused
11Ć14 all The physical address of the unused word of PLC-3 system memory.
This is the physical address corresponding to the extended address
E60.0.0.0
15Ć18 all The total number of words in the PLC-3 system memory
(both used and unused)