Unit Settings; I/O Data Mapping - Omron C200HW-PRM21 Operation Manuals

Unit Settings

5-1

Unit Settings

5-1-1 I/O Data Mapping

Data flow
I/O refresh
52
This Special I/O Unit is configurable with settings made in a dedicated DM
area. The assigned DM area depends on the Unit number setting.
Unit
number
0
DM1000 ~ DM1017
1 DM1100 ~ DM1117
2 DM1200 ~ DM1217
3 DM1300 ~ DM1317
4 DM1400 ~ DM1417
5 DM1500 ~ DM1517
6 DM1600 ~ DM1617
7
DM1700 ~ DM1717
8 DM1800 ~ DM1817
9
DM1900 ~ DM1179
A
DM2000 ~ DM2017
B DM2100 ~ DM2117
C DM2200 ~ DM2217
D DM2300 ~ DM2317
E DM2400 ~ DM2417
F DM2500 ~ DM2517
* Alternatively starting at DM7000 ~ DM8500, selected by PLC setup of C200H..:
DM6602 ≠ 0000 (see Operation Manual of CPU unit)
The first word in the DM area allocated to the unit will be indicated by DM m,
the last word by DM m+17.
The Unit settings determine the areas and methods for data exchange
between the PLC CPU and the C200HW-PRM21.
Data entered in the Unit settings area is only transferred to the unit during
initialisation, i.e. at power ON and at Special I/O Unit restart.
Note The Unit operates in default mode when all Unit settings are set to zero.
The figure below shows the flow of remote I/O data in the PLC system. It is
possible to map the I/O data to the DM, LR, IR and HR areas of the PLC
memory. Up to two input areas and two output areas may be assigned.
Output data is transferred via the bus on the Backplane (I/O Bus) to the
output buffer of the Unit. At certain time intervals this data is transmitted to the
slaves over PROFIBUS. Slave input data coming from PROFIBUS is first
stored in the input buffer of the Unit. At certain times, this data is transferred
to the memory of the PLC. The exchange of data via the I/O Bus occurs
during an I/O refresh.
By default, I/O refreshes are executed at the end of each PLC program cycle,
but can also be triggered by the IORF instruction.
DM area*
All PLC models
All PLC models except:
C200HS, C200HE,
C200HG-CPU3[ ]-E/CPU4[ ]-E,
C200HX-CPU3[ ]-E/CPU4[ ]-E
Section 5-1