Schneider Optics Modicon Quantum Ethernet manual Read and Write Mstr Operations, Control Block

The MSTR Instruction

Hex Error Code	Meaning
5047	The MTU is invalid
5048	The hardware length is invalid.
5049	The route specified cannot be found.
504A	Collision in select call: these conditions have already been selected by
	another task.
504B	The task id is invalid.

CTE Error Codes The following error codes are returned if there is a problem with the Ethernet configuration extension table (CTE) in your program configuration.

Hex Error Code	Meaning
7001	There is no Ethernet configuration extension.
7002	The CTE is not available for access.
7003	The offset is invalid.
7004	The offset + length is invalid.
7005	Bad data field in the CTE.

3.2.4Read and Write MSTR Operations

An MSTR Write operation (type 1 in the displayed register of the top node) transfers data from a master source device to a specified slave destination device on the network. An MSTR Read operation (type 2 in the displayed register of the top node) transfers data from a specified slave source device to a master destination device on the network. Read and Write use one data master transaction path and may be completed over multiple scans.

Note: TCP/IP Ethernet routing must be accomplished via standard third-party

Ethernet IP router products.

Control Block	The registers in the MSTR control block (the top node) contain the Read or Write
Utilization	information as described in the following table:
	Register	Function	Content
	Displayed	Operation Type	1 = Write, 2 = Read.
	First Implied	Error status	Displays a hex value indicating an MSTR error.
			Exception response, where	Exception code
			response size is incorrect.	+ 3000
			Exception response where	4001
			response size is incorrect.
			Read Write

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