5X00070G03 input module

When executed from logic, Special Function blocks place commands from anywhere in the Command List directly into the command queue, so that the command or commands will be the next one or ones to be sent. The normal way to use Special Functions is to setup commands in the Command List and set their Enable parameter set to zero (0). This will prevent the commands from being executed until added to the queue by Special Functions logic. However, any command from the command list may be added to the queue, regardless of the value in the Enable parameter. This allows normal polling order to be interrupted and to have up to six commands sent out of sequence, one after the other, before normal polling resumes.

Write Block - Command Control

Blocks in the range of 5001 to 5006 are used for Port 1, and blocks in the range of 5101 to 5106 are used for Port 2. The last digit in the block code defines the number of commands to process in the block. For example, a block code of 5003 contains 3 command indexes that are for Port 1. The Command index parameters in the block have a range of 0 to 99 and correspond to Master Command List entries. The module responds to a Command Control write block with a input image read block containing the number of commands added to the command queue for the port.

Pass-Through Control Blocks 

If one or more of the slave ports on the module are configured for formatted pass-through mode, the module will send input image blocks with identification codes of 9956, 9957, 9958 or 9959 to the processor for each write command received. Any MODBUS Function 5, 6, 15 or 16 command will be passed from the port to the processor using a block identification number that identifies the Function Code received in the incoming command. Ladder logic must exist in the process to handle the receipt of all MODBUS write functions and to respond as expected to commands issued by the remote MODBUS Master device.

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