12.6.3. Reading an Input Assembly with MSG Instruction

For this example, we have created a ConveyLinx-Ai Family Modules in our Ethernet Tree and added a MSG Instruction to a ladder rung. We named this MSG block “ReadZPA” and created the Controller Tag for it. With this MSG Instruction we are going to read all 21 registers from PLC Inputs for ZPA Mode. We also created a Controller Tag called “ZPA_Inputs” which is an INT array of 21 elements in order to hold the data.

*When reading any input Assembly with a MSG Instruction, be sure you create the Destination Element Controller Tag an array of INT with the number of elements that match the number of registers in the Assembly

	From the Message Type drop down, select CIP Generic
	From the Service Type drop down, select Get Attribute Single
	For the Instance Field, enter “105” which is the Assembly vale for the ZPA Mode inputs
	For the Class Field, enter “4”
	For the Attribute Field, enter “3”
	For the Destination Element, use the Tag Browser drop down to select ZPA_Inputs and expand to select the [0] element