SST SST-PB3-CLX-RLL Communication module

Modbus Command Control Blocks (5001 to 5016) Blocks 5001 to 5016 enable the user to list as many Modbus Commands in the configuration file MNET.CFG as desired (maximum quantity = 16 per Client), then dynamically set the command execution quantity per client. Command Request description (Write Block) Command Control blocks place commands in the command list into the command queue. The Client has a command queue of up to 16 commands. The module services commands in the queue before the user defined command list. This gives high priority to commands in the queue. Commands placed in the queue through this mechanism must be defined in the module's command list.

With this Command Control block

 the commands may be placed in the command queue with an Enable parameter set to zero. One to 16 commands can be placed in the command queue with a single request. The following table describes the format for this block.The Enable parameter in the configuration file's Modbus Command list must be set to either 0 or 1 and no other value. It does not matter if the value is set to 0 or 1 because the execution of the command is controlled by Blocks 5001 to 5016 and by Block 6000 in ladder logic.

Command Response description (Read Block)

 The module responds to a Command Control block with a block containing the number of commands added to the command queue for the port. The following table describes the format for this block. 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 to be placed in the command queue. The Command index parameters in the block have a range of 0 to 15 and correspond to the module's command list entries.

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