Schneider Optics Modicon Quantum Ethernet Mstr Function Error Codes, Middle Node, Bottom Node

The MSTR Instruction

Register	Content
Displayed	Identifies one of ten MSTR operations legal for TCP/IP
	(1 ... 4 and 7 ... 12).
First implied	Displays error status.
Second implied	Displays length (number of registers transferred).
Third implied	Displays MSTR operation-dependent information.
Fourth implied	High byte: Destination index.
	Low byte: Quantum backplane slot address of the web
	embedded server module.
Fifth implied	Byte 4 of the 32-bit destination IP Address.
Sixth implied	Byte 3	of the 32-bit destination IP Address.
Seventh implied	Byte 2	of the 32-bit destination IP Address.
Eight implied	Byte 1	of the 32-bit destination IP Address.

Middle Node	The 4x register entered in the middle node is the first in a group of contiguous
Content	holding registers that comprise the data area. For operations that provide the
	communication processor with data such as a Write operation, the data area is the
	source of the data. For operations that acquire data from the communication
	processor, such as a Read operation, the data area is the destination for the data.
	In the case of the Ethernet Read and Write CTE operations (see sections 3.2.11
	and 3.2.12), the middle node stores the contents of the Ethernet configuration
	extension table in a series of registers.
Bottom Node	The integer value entered in the bottom node specifies the length - the maximum
Content	number of registers in the data area. The length must be in the range 1 ... 100.

3.2.3MSTR Function Error Codes

	If an error occurs during an MSTR operation, a hexadecimal error code will be
	displayed in the first implied register in the control block (the top node). Function
	error codes are network-specific.
TCP/IP Ethernet	An error in an MSTR routine over TCP/IP Ethernet may produce one of the
Error Codes	following errors in the MSTR control block:

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