I/O Data mapping
Section 4-2
55
Note
*
1
The setting error(s) is indicated in IR n+3 and IR n+4 (see section 4-3-2) and the
ERR LED will be blinking. Only the control and status area is transferred, so no
transfer of additional I/O data and also no CANopen communication.
*
2
If the specified number of objects would make the area exceed the boundary of
the PLC's DM, LR, IR or HR area, it is classified as a setting error and the error
handling will be the same as in *
1
.
A setting error also occurs when the total amount of data of all input or output areas
exceeds 100 words. The error handling is the same as in *
1
.
Note
The DM settings m+1, m+3, m+5, m+9, m+11, and m+13 indicate the
start
address
of the respective objects in the PLC memory. The amount of
memory that is allocated after this start address depends on the number and
type of mapped objects. See m+1 for the available memory per PLC area.
Note that a 32-bit object requires 2 words and a 64-bit object 4 words and
therefore these objects can not start at the highest PLC address in the
memory range. This will result in a DM setting error and IR n+4 will indicate
that the boundary of the respective PLC memory area is exceeded.
It is possible to have both 32-bit
and
64-bit objects. In the PLC memory area,
the 64-bit objects will start directly after the 32-bit objects.
Allocation of objects to PLC memory locations:
The 8-bit objects with an odd sub-index in the object dictionary will be in
the least significant byte of a PLC memory location. The even sub-
indexes at the most significant part.
The least significant 16-bits of a 32-bit or a 64-bit object will be at the
lowest PLC address. The higher bits are allocated to the next PLC
address(es).
The Unit cannot check the validity of the contents of any PLC data area, from
which input data is to be transferred. Any data present in the area will be
transferred to the input application objects in the object dictionary of the Unit.
The Unit does not check if the selected output areas in the host PLC is in use
by other Units, e.g. other fieldbus Master or Slave Units mounted in the same
system. If so, this Unit’s data may overwrite another Unit’s data, or vice
versa.
!
Caution
!
Caution
Summary of Contents for C200HW-CORT21-V1
Page 2: ...C200HW CORT21 V1 CANopen Slave Unit OPERATION MANUAL OMRON Cat No W904 E2 2 ...
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Page 6: ...C200HW CORT21 V1 CANopen Slave Unit Operation Manual Produced June 2001 ...
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Page 47: ...Performance Section 2 3 30 ...
Page 85: ...Control and Status area Section 4 3 68 ...
Page 113: ...Flow diagrams Section 6 6 96 ...
Page 123: ...Maintenance Section 7 3 106 ...
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