Omron C200HW-PRM21 Operation Manuals page 69

Unit Settings
User configurable
Maximum I/O data
Data representation
The mapping of the PROFIBUS-DP slaves onto the buffers of the Unit is
defined with the configurator described in section 4. The mapping between
the I/O data buffers of the Unit and the PLC memory is user configurable via
the settings in data memory.
For C200HS, the maximum number of mapped I/O data is 80 words and for
C200HE, C200HG, C200HX and CS1-series, the maximum is set to 300
words. If the user-defined mapping exceeds these values, the mapping is
ignored (no data will be exchanged) and a fatal error is indicated in IR n+2
(see section 5-3) and the ERR LED is turned ON.
The maximum amount of data mapped per single transfer block is 100 words.
In the I/O data buffers, the high bytes of PLC data always occupy even
addresses, the low bytes occupy odd addresses (Motorola format).
The representation of PROFIBUS-DP slave data in the I/O data buffer
depends on the specifications of the slave. Please consult the slave
manufacturers' documentation. In rare cases it may be necessary to modify
the data representation either at the slave side, or in the PLC program.
Section 5-1
53