Reliance Electric S-D4008-A industrial module

User Constructed Command Block (9901) Block identification code 9901 issues one or more user constructed commands. When the module receives a block 9901 identification code, it will place the included commands into the command queue.Refer to the command list section of this documentation for a detailed definition of the fields contained in this block. They are the same as those used to construct the commands in the command list. There is no response block built by the module to send back to the processor after the block is processed. The commands are placed in the command queue and issued at a high priority.

This block and block 9902 should be used 

when controlling double-point data points in remote units using general commands. This provides complete control of the slave devices under ladder logic control. Alternatively, the slaves can be controlled by changing data in the database and having the data be transferred using pre-constructed commands in the user's command list. Some points only accept value of on for control (that is, LED reset or activate characteristic). For these points, block 9901 and 9902 should only be utilized. Command Control Block (9902) The block 9902 identification code is used by the processor to send a list of commands to be placed in the command queue from the user configured command list. Commands placed in the queue with this method need not have their enable bit set in the command list.

Block ID 

This field contains the value of 9902 identifying the enable command to the module. 1 Command count This field contains the number of commands to enable in the command list. Valid values for this field are 1 to 60. 2 to 61 Command Numbers to enable These 60 words of data contain the command numbers in the command list to enable. The commands in the list will be placed in the command queue for immediate processing by the module. The first command in the list has an index of 0.

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