
Message Packet Formats
Chapter 5
5-15
T
able 5.D
Contents
of Status DA
T
A for 1775-KA Modules
Byte Bit Value Meaning
1
Operating Status of PLC-3 Processor
0-1 0
1
2
Program Mode
T
est Mode
Run Mode
2 --
Not Used
3 0
1
Normal
Major Processor Fault
4 0
1
Normal
Shutdown Request
5 0
1
Normal
Shutdown in Ef
fect
6-7 --
Not Used
2 T
ype of Station Interface
0-3 6
7
1775-KA, Data Highway Port
1775-KA, RS-232-C Port
3
Current Context (Stored in Bits 4 to 7)
4
Thumbwheel Number
5-6
Mode Control W
ord — The logical address of the mode control word is E0.0.0.8.
7-8
Starting Byte Address of the Diagnostic Counters and T
imers — There is a separate
block of diagnostic timers and counters for the Data Highway port and the RS-232-C
port. The address given here is the one for the port that received the diagnostic status
command.
9
Series and Revision Number of the 1775-KA Module
0-4 0
1
Revision A
Revision B, Etc.
5-7 0
1
Series A
Series B, Etc.
10
Not Used
11-14
The Physical Address of the Unused W
ord of PLC-3 System Memory — This is the
physical address corresponding to the logical address E60.0.0.0.
15-18
The Total Number of Words in the PLC-3 System Memory (Both Used and Unused) —
This is the physical word address that corresponds to the logical address E60.0.0.0.
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