Allen-Bradley MicroLogix 1200 Reference Manual page 60

3-16 Function Files
Publication 1762-RM001C-EN-P
Table 3.14 DF1 Half-Duplex Slave Diagnostic Counters Block
Word Bit Description
14 - NAK Packets Received
15 - Polls Received
16 - Bad Message Packets Received
17 - No Buffer Space
18 - Duplicate Message Packets Received
19 to 22 - Reserved
Table 3.15 Modbus RTU Slave Diagnostic Counters Block
(MicroLogix 1200 Controllers, and MicroLogix 1500 1764-LSP Series B and 1764-LRP Processors)
Word Bit Description
6 - Diagnostic Counters Category Identifier Code (always 2)
7 - Length (always 30)
8 - Format Code (always 4)
9 0 CTS
1 RTS
2 Reserved
3 Channel 0 - Reserved, Channel 1 - DCD
4 to 15 Reserved
10 - Total Message Packets Sent
11 - Total Message Packets Received for This Slave
12 - Total Message Packets Received
13 - Link Layer Error Count
14 - Link Layer Error Code
15 to 22 - Reserved
Table 3.16 ASCII Diagnostic Counters Block
(MicroLogix 1500 1764-LRP Processors only)
Word Bit Description
6 - DLL Diagnostic Counters Category Identifier code (always 2)
7 - Length (always 30)
8 - Format Code (always 5)
9 0 CTS
1 RTS
2 Reserved
3 Channel 0 - Reserved, Channel 1 - DCD
4 to 15 Reserved
10 0 Software Handshaking Status
1 to 15 Reserved
11 - Echo Character Count
12 - Received Character Count