Publication 1762-RM001C-EN-P
3-18 Function Files
Input/Output Status File
The input/output status (IOS) file is a read-only file in the controller that
contains information on the status of the embedded and local expansion
I/O. The data file is structured as:
Table 3.18 Modbus RTU Slave Diagnostics
(MicroLogix 1200 Controllers, and MicroLogix 1500 1764-LSP Series B and 1764-LRP Processors)
Word Bit Description
43 - Diagnostic Counters Category Identifier Code (always 10)
44 - Length (always 14)
45 - Format Code (always 0)
46 - Pre-Send Time Delay
47 0 to 7 Node Address
8 to 15 Reserved
48 - Inter-Character Timeout
49 - RTS Send Delay
50 - RTS Off Delay
51 0 to 7 Baud Rate
8 and 9 Parity
10 to 15 Reserved
52 - Diagnostic Counters Category Identifier Code (always 6)
53 - Length (always 32)
54 - Format Code (always 0)
55 - Presentation Layer Error Code
56 - Presentation Layer Error Count
57 - Execution Function Error Code
58 - Last Transmitted Exception Code
59 - Data File Number of Error Request
60 - Element Number of Error Request
61 - Function Code 1 Message Counter
62 - Function Code 2 Message Counter
63 - Function Code 3 Message Counter
64 - Function Code 4 Message Counter
65 - Function Code 5 Message Counter
66 - Function Code 6 Message Counter
67 - Function Code 8 Message Counter
68 - Function Code 15 Message Counter
69 - Function Code 16 Message Counter
Table 3.19 I/O Status File
Word Description
0 Embedded Module Error Code – Always zero
1 to 6 Expansion Module Error Code – The word number corresponds to the module’s slot
number. Refer to the I/O module’s documentation for specific information.
(MicroLogix 1200)
1 to 8 Expansion Module Error Code – The word number corresponds to the module’s slot
number. Refer to the I/O module’s documentation for specific information.
(MicroLogix 1500)
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