Schneider-optics Web Embedded Server User Manual download pdf (Page 38)

The MSTR Instruction

840 USE 115 00 Version 1.0

Middle Node

Content

The 4x re

ister entered in the middle node is the first in a

roup of conti

uous

holdin

isters 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 ac

uire 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 confi

uration

extension table in a series of re

isters.

Bottom Node

Content

The inte

er value entered in the bottom node specifies the

length

- the maximum

number of re

isters in the

data area

. The

length

must be in the ran

e 1 ... 100.

3.2.3 MSTR Function Error Codes

If an error occurs durin

an MSTR operation, a hexadecimal error code will be

displa

ed in the first implied re

ister in the

control block

(

the top node

)

. Function

error codes are network-specific.

TCP/IP Ethernet

Error Codes

An error in an MSTR routine over TCP/IP Ethernet ma

produce one of the

followin

errors in the MSTR

control block

Displayed

Identifies one of ten MSTR operations le

al for TCP/IP

(1 ... 4 and 7 ... 12).

First implied Displays error status.

Second implied Displays len

th (number of re

isters transferred).

Third implied Displays MSTR operation-dependent information.

Fourth implied Hi

h 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.

ht implied Byte 1 of the 32-bit destination IP Address.

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 104 105

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Schneider-optics Web Embedded Server User Manual Page 38

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