These instances essentially group the appropriate Modbus registers into contiguous Input and Output array image
that fit into the Allen-Bradley Logix 5000 controller tags.
Please refer to Connecting ConveyLinx to Rockwell PLC’s –
Insight Automation publication ERSC-1520 for details on how to
connect ConveyLinx to Rockwell Ethernet I/P capable PLCs.
PROFINET IO ASSEMBLY INSTANCE STRUCTURE
Prior to connecting any modules to a Profinet IO capable (Siemens, for example) PLC, a GSDXML configuration file
needs to be installed in your PLC programming software (i.e. STEP 7 or TIA Portal). The GSDXML file contains,
among other things, the definition of memory size required when connecting a m o du le to a Siemens PLC with
Profinet IO. When assigning an individual module to a PLC, you decide what memory address to use. The GSDXML
file stipulates that each module requires 64 bytes of input data from the module to the PLC and 64 bytes of output
data from the PLC to the module. When assigning an individual module to a PLC, you decide what physical PLC
memory address to use as the beginning of these 64 byte blocks.
In all of the charts showing module data registers and their assigned function, for Profinet IO these are indicated as
“Byte 0, Byte 1,...Byte 32”, etc. These are offsets from the starting address in the Siemens PLC memory assigned
by the Siemens programming software when the module was installed into the network. For example, if a
module’s inputs are installed beginning at %IB256, then from our charts, the data for “Byte 6 and Byte 7” would be
at addresses %IB262 and %IB263 respectively.
Please refer to Connecting ConveyLinx to Profinet PLCs – Insight
Automation publication ERSC-1525 for details on how to connect
ConveyLinx to Profinet I/O capable PLCs.
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