Rockwell Automation Publication 5069-UM003B-EN-P - January 2020
37
Compact 5000 I/O Serial Module Features
Chapter 3
Figure 10 - Modbus Master Read Command
Modbus Master Functions
In Modbus mode, the serial module supports both Modbus ASCII and Modbus
RTU to connect to Modbus enabled devices like flowmeters, power meters or
remote RTU talking on Modbus RTU/ASCII.
ControlLogix 5580/CompactLogix 5380
5069-SERIAL Modbus Master
Config Tag
Command List
Output Tag Output
Data to Slave
Input Tag Input
Data from Slave
Produced Data
Consumed Data
CH0
Config Data
Consumed Data
Produced Data
CH1
Command List Interpreter
Modbus RTU/ASCII
Response with
Read Data
Modbus Slave
Command
Command List Table
Table 9 - Modbus Master Configuration Parameters
Parameter
Definition
Available Options
Modbus
Format
Selecting communication method of Modbus of each channel.
• 0 = RTU (default)
• 1 = ASCII
– Intervals of up to one second may elapse between characters within
the message. Unless the user has configured a longer timeout, an
interval greater than 1 second means that an error has occurred.
Response
Timeout
The Maximum Delay time of each channel until it receives a response for Modbus
Master Command from Modbus Slave.
When the maximum time has passed, the Modbus Master determines the Modbus
Slave did not respond.
• 0…3600000 (x1 ms) (default = 200)
Broadcast
Pause
The Wait time of each channel until the Modbus Slave finishes processing according
to broadcasted command from the Modbus Master.
Modbus Master does not send the next command until this time has passed.
• 0…3600000 (x1 ms) (default = 200)
Inter-frame
Timeout
Maximum delay time to receive Data of each channel
• 0 is not a valid value. Use
minimum value.
Retry Count
This parameter specifies the number of times a command is retried if it fails. If
Master Port does not receive a response after the last retry, the Slave devices
communication is suspended on the port for Error Delay Counter scans.
• 0…127 (default = 0)
Содержание Allen-Bradley 5069-L3100ERMS2
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