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Slave Polling Control and Status Two arrays are allocated in the module’s primary object to hold the polling status of each slave on the Master ports. This status data can be used to determine which slaves are currently active on the port, are in communication error or have their polling suspended and disabled. Ladder logic in the processor can be written to monitor and control the status of each slave on a Master port. The following table describes the structure of this object.Using special blocks, the processor can request the current data for the slaves. Through the use of other blocks, the processor can enable or disable the polling of selected slaves.

MODBUS Message Data 

This version of the module's program includes formatted pass-through (page 129) mode. In this mode, write messages sent to a slave port are passed directly through to the processor. It is the responsibility of the ladder logic to process the message received using this feature. Two data objects are required for this mode: a variable to hold the length of the message and a buffer to hold the message. This information is passed from the module to the processor using block identification codes of 9956 through 9959, depending on the Modbus function code. Word two of this block contains the length of the message and the message starts at word 3. Other controller tags are required to store the controlled values contained in these messages. The MODBUS protocol supports controller of binary output (coils - functions 5 and 15) and registers (functions 6 and 16).

Adding the Module to an Existing CompactLogix Project

 Important: The following steps describe how to install and configure the MVI69-MCM module with RSLogix 5000 version 15 or older. If you are using RSLogix 5000 version 16, please refer to Sample Add-On Instruction Import Procedure (page 20). Important: The MVI69-MCM module has a power supply distance rating of 2 (L43 and L45 installations on first 2 slots of 1769 bus) If you are installing and configuring the module with a CompactLogix processor, follow these steps. If you are using a MicroLogix processor, refer to the next section.

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