5X00070G01 Analog input module

Use the parameters passed with the block to construct the command. 

The INTERNAL DB ADDRESS parameter specifies the module’s database location to associate with the command. 

The POINT COUNT parameter defines the number of registers for the command. 

The SWAP CODE changes the word or byte order.

The DEVICE ADDRESS parameter defines the MODBUS address on the target MODBUS device to consider.
The FUNCTION CODE parameter is one of those defined in the ProSoft MODBUS Command Set documentation. The parameter fields in the block should be completed as required by the selected function code. Each command type has its own set of parameters. When the block is received, the module will process it and place the command in the command queue. The module will respond to each command block with a input image read block.

Read Block - Event Command

Word two of the block can be used by the ladder logic to determine if the command was added to the command queue of the module. The command will only fail if the command queue for the port is full (100 commands for each queue) or the command requested is invalid.Note: Overuse of Special Functions may substantially slow or totally disrupt normal Command List polling. Use Special Functions sparingly. Special Functions are meant to be used when a few preconfigured commands need to be sent as one-shot commands triggered by special circumstances or uncommon events.

Command Control

 During normal operation, the module executes commands from the Command List in the order they appear in the list and only when those commands have the Enable parameter set to a non-zero value. If the Enable parameter is set to zero (0), the command is considered disabled and not sent. In addition to the Command List, each port also has a high-priority command queue. Transmission preference is given to commands in the queue; therefore, any command in this queue will be sent instead of sending a command from the Command List. Commands are placed in the queue either by the Event Command blocks (page 125) or by the Special Function blocks. Event Command blocks place commands in the queue one at a time. Special Function blocks can place from one to six commands into the queue each time they are executed

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