Modbus2Locpara Data Type - Allen-Bradley Micro800 General Instructions Manual

Parameter Data type
Channel UINT
TriggerType UDINT
Cmd USINT
ElementCnt UINT

MODBUS2LOCPARA data type

The following table describes the MODBUSLOCPARA data type parameters.
Description
Local Ethernet port number:
• 4 for Micro850 & Micro820 embedded Ethernet port
Message trigger type:
• 0: Msg Triggered Once (when IN goes from False to True)
• 1 to 65535 - Cyclic trigger value in milliseconds. Message triggered periodically when IN is true and the previous message
execution completes.
• Set the value to 1 to trigger messages as quickly as possible.
Modbus command:
• 01: Read Coil Status (0xxxx)
• 02: Read Input Status (1xxxx)
• 03: Read Holding Registers (4xxxx)
• 04: Read Input Registers (3xxxx)
• 05: Write Single Coil (0xxxx)
• 06: Write Single Register (4xxxx)
• 15: Write Multiple Coils (0xxxx)
• 16: Write Multiple Registers (4xxxx)
• Others: See MODBUS2LOCPARA custom command support
Limits
• For Read Coil/Discrete inputs: 2000 bits
• For Read Register: 125 words
• For Write Coil: 1968 bits
• For Write Register: 123 words
MSG_MODBUS2 message triggering
A Modbus message can be triggered periodically by setting a non-zero value to the
TriggerType parameter. The following table describes what happens when the
TriggerType parameter is used with the MSG_MODBUS2 function block.
Action
Message is enabled
Trigger timer expires before the message
completes
Message completes before the trigger time
expires
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
Communication instructions
Results
Trigger timer starts
Message is immediately triggered in the next ladder
scan cycle.
Message is triggered when the trigger time expires.
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