CP450T-ETH 1SBP260189R1001 Touch screen

Module Data Object (MCM1ModuleDef) All data related to the MVI69-MCM is stored in a user defined data type. An instance of the data type is required before the module can be used. This is done by declaring a variable of the data type in the Controller Tags Edit Tags dialog box. The following table describes the structure of this object.If the register count is evenly divisible by n, the number of blocks is easy to compute and the ladder is much simpler to write. If the number is not evenly divisible by n, special handling of the last block of data must be developed, as it must transfer less than n words.

This object contains objects that define the configuration

 user data, status and command control data related to the module. This object reads and write data between the module and the processor. Values entered determine the ladder logic and data size required in the application. The ReadData and WriteData arrays must be sized to or larger than the count values entered. The ladder logic must process the number of blocks of data to be transferred. The number of blocks is computed as follows: BlockCnt = INT(RegCnt/n) + if(MOD(RegCnt, n), 1,0) Where n is the block transfer size, and equals 60, 120 or 240.

The Backplane Fail Count (page 52) parameter determines 

if the module should continue communicating on the MODBUS network when the backplane transfer operation fails. A value of zero indicates that the module should continue communicating when the backplane is not operational. If the value is greater than zero, the backplane will be retried the entered number of times before a failure will be reported and communication will cease on the ports. When backplane communication is restored, the module will start communicating on the network. For example, if you enter a value of 10 for the parameter, the module will stop all MODBUS communications if 10 successive backplane errors are recognized. When a successful transfer is recognized, the module will resume communications on the network.

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