ABB Remote I/O RIO600, Руководство по установке и пусконаладке

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7.1.4 Modbus TCP/IP diagnostic counters over Web HMI
Modbus TCP/IP diagnostic counters can be viewed via the WHMI. These counters
show the sent and received Modbus protocol link frames and Modbus errors.
Table 115: TCP/IP diagnostic counters
Counter Description
Received frames Total amount of received Modbus frames.
Transmitted frames Total amount of transmitted Modbus responses.
Transmitted Exc
A
Total amount of exception responses 1 and 2.
These exception responses usually reveal configuration errors on the
Modbus client’s side.
Transmitted Exc
B
Total amount of exception responses 3.
These exceptions reveal the application level rejections.
TCP connection status Shows the value "Green" via LED on WHMI, if TCP/IP instance is in use.
A Modbus client has connected to the TCP socket and Modbus TCP
messages are received regularly. In all other cases, it shows the value "Red"
via a LED.
The counters and status are reset when the client makes a TCP socket disconnection
or if the live TCP socket connection times out.
7.1.5 Common Modbus TCP/IP diagnostic counters
Table 116: TCP/IP diagnostic counters (client independent)
Counter Description
CnReject No sockets Amount of connection requests rejected due to unavailable TCP sockets
CnReject Not reg Amount of connection requests rejected since the client is not registered
7.1.6 Supported Modbus function codes
Table 117: Function codes supported by RIO600
Function code Name Description
01 Read coil status Reads the status of discrete outputs
02 Read digital input status Reads the status of discrete inputs
03 Read holding registers Reads the contents of output registers
04 Read input registers Reads the contents of input registers
05 Force single coil Sets the status of a discrete output
06 Preset single register Sets the value of a holding register
08 sub
function code
00
Diagnostics: Request query
data
The data in the query data field is returned (looped
back) in the response. The entire response is
identical to the query.
Section 7
1MRS757488 H
Modbus TCP communication
172 RIO600
Installation and Commissioning Manual