Omron 3G3FV-PDRT1-SIN user manual Overview of Messages and Responses, Command Format

CompoBus/D Communications Card Operations Chapter 5

HCommunications Flags

Type	Name	Address		Content
		Word	Bit
SYSMAC	Network Communications	A502	7: Port 7	0: Execution disabled (executing)
PC flags	Enabled Flag		6: Port 6	1: Execution enabled (not executing)
			5: Port 5
			4: Port 4
			3: Port 3
			2: Port 2
			1: Port 1
			0: Port 0
	Network Communications	A502	15: Port 7	0: Normal end
	Error Flag		14: Port 6	1: Abnormal end
			13: Port 5
			12: Port 4
			11: Port 3
			10: Port 2
			9: Port 1
			8: Port 0
Master Unit	Message Communications	25 x Unit	12	0: Communications error detected;
status flag	Enabled Flag	number +		Master Unit message communica-
		1501		tions not possible.
				1: Master Unit communications pos-
				sible.

5-2-4 Overview of Messages and Responses

When message communications are used, the Inverter’s CompoBus/D Communications Card returns responses as explained below.

Basically, CompoBus/D (DeviceNet) communications are executed in 1-byte (8-bit) units. In the case of single-word data (16 bits), the rightmost bits (least significant) and the leftmost bits (most significant) are reversed in order due to the following reasons:

•Data on communications line is transmitted in the order of rightmost bits and leftmost bits.

•Data that is internally processed by PC for issuing commands is transmitted in the order of leftmost bits and rightmost bits.

Therefore, reverse the order for attributes where “Word” is written in the “Size” column in the tables on subsequent pages and create attached data or read response data.

Note There is no need to take this into consideration for remote I/O because the rightmost bits and leftmost bits are automatically reversed.

HCommand Format

28

01

32 bytes max.

Command code	Destination	Service	Class ID	Instance ID	Service data (attribute No. or at-
(FINS command for PC)	node address	code			tribute No. and write data)

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