Comtrol Modbus TCP User Guide - Manual (Page 31)

DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I Chapter 2. Programming Interface - 31
Retrieve Statistics Message
2.5. Retrieve Statistics Message
The data returned from the Retrieve Statistics message contains various counters. The Retrieve Statistics
message formats the data into 32-bit integers and returns data in an array of WORDs. The first WORD
contains the most significant word and the second WORD contains the least significant word.
Note: Some Modicon PLC programming software, such as Concept, requires one to be added to the address
offset. This is because their address range begins at 40001, while the address range on the DeviceMaster
UP begins at zero.
The following table displays the format of the Retrieve Statistics message.
The Retrieve Statistics messages have the following characteristics.
DeviceMaster UP Addressing for the
Statistics Modbus/TCP Messages
Serial Port
1
Serial Port
2
Serial Port
3
Serial Port
4
Access
Rule
Unit ID 255 (FF hex) 255 (FF hex) 255 (FF hex) 255 (FF hex) N/A
Statistics Address 1600 2600 3600 4600 Read Only
Index Name Data Type Data Value(s) Access Rule
1 Receive Byte Count UDINT 0=default Read only
2 Receive Packet Count UDINT 0=default Read only
3 Transmit Byte Count UDINT 0=default Read only
4 Transmit Packet Count UDINT 0=default Read only
5 Dropped Packet Count to PLC UDINT 0=default Read only
6 Parity Error Count UDINT 0=default Read only
7 Framing Error Count UDINT 0=default Read only
8 Overrun Error Count UDINT 0=default Read only
9
Unexpected Transmit Sequence
Number errors
UDINT 0=default Read only
10 Invalid Modbus/RTU Device Responses UDINT 0=default Read only
11 Modbus/RTU Device Timeouts UDINT 0=default Read only
12 Reserved UDINT 0 Read only
Retrieve Statistics Message Description
Receive Byte Count This attribute counts the number of bytes received on the serial port.
Receive Packet Count This attribute counts the number of packets received on the serial port.
Transmit Byte Count This attribute counts the number of bytes transmitted on the serial port.
Transmit Packet Count This attribute counts the number of packets transmitted on the serial port.
Dropped Packet Count to PLC
This attribute counts the number of dropped receive packets on the serial
port intended for the PLC due to:
• No STX byte(s) found
• No ETX byte(s) found
• Time-outs
• Too large of packet
• Receive buffer queue overflows
Parity Error Count
This attribute counts the number of packets with parity errors received on
the serial port.
Framing Error Count
This attribute counts the number of packets with framing errors received
on the serial port.