Prosoft-technology MVI56E-MCMR Manual de usuario descargar pdf (Pagina 163)

MVI56E-MCMR ♦ ControlLogix Platform Reference

Modbus Communication Module with Reduced Data Block User Manual

ProSoft Technology, Inc. Page 163 of 225

May 13, 2014

Command Error List Blocks (9950, 9951)

The Get Command Error List special function is applicable only when the

module's port is configured as a Modbus Master. Use block identification codes

9950 for Port 1 or 9951for Port 2 anytime you want to request the Command

Error List for the 100 user-configurable commands that may be sent by that port.

There is a one-to-one correspondence between the position of a command in the

Command List and its corresponding execution status in the Command Error

List. Each word in the Command Error List holds the most recent execution

status of each corresponding command in the MODBUS PORT 1 COMMANDS or

MODBUS PORT 2 COMMANDS lists, which were configured in the PCB module

configuration file and downloaded to the module. As each command is executed,

whether as part of normal, repetitive polling or if triggered by Command Control,

the status of the most recent execution will be placed in the appropriate word of

the 100-word Command Error List.

The Command Error List is requested using a "Get Attribute Single" service type

MSG instruction. The following illustration shows the MSG instruction

configuration for a Get Command Error List MSG.

The format of the data returned by the Get Command Error List MSG is shown in

the following table.

1 2 ... 158 159 160 161 162 163 164 165 166 167 168 ... 224 225

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Prosoft-technology MVI56E-MCMR Manual de usuario Pagina 163