First Modbus project, rookie question I hope.
Modbus device -> DSPLE -> Control Logix L72 via Ethernet I/P
Need to read 5 Modbus registers. Four are 16 bit, one is 32 bit.
I have a block set up in the DSP with a size of 5 and mapped the appropriate Modbus registers.
My question is for the input instance of the Generic Ethernet module, what do I set the 32 bit size to?
I'm confused as to how the DSP moves the 16 bit words to the 32 bit tags. Will it only use two tags for the four 16 bit words, or will it use four tags and fill in the first 16 bits of the each tag? The 32 Modbus register I'm assuming will move to a single tag in the control logix.
Thanks!
Modbus device -> DSPLE -> Control Logix L72 via Ethernet I/P
Need to read 5 Modbus registers. Four are 16 bit, one is 32 bit.
I have a block set up in the DSP with a size of 5 and mapped the appropriate Modbus registers.
My question is for the input instance of the Generic Ethernet module, what do I set the 32 bit size to?
I'm confused as to how the DSP moves the 16 bit words to the 32 bit tags. Will it only use two tags for the four 16 bit words, or will it use four tags and fill in the first 16 bits of the each tag? The 32 Modbus register I'm assuming will move to a single tag in the control logix.
Thanks!