Omron CJ1W-NC271 - 12-2009, Operation Manual

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Transferring PCU Parameters
Section 5-2
is ON (when the PCU is in initial processing or reading or writing the back-
up data from or to the Memory Card).
(4) If data is written while different data is being transferred, a Multistart Error
(Unit error code: 0021) will occur and data will not be written to the PCU.
(5) Do not restart the PCU or turn OFF the power to the PLC while data is
being written. The data will not be transferred correctly, and normal PCU
operations may not be possible.
Data writing starts when the WRITE DATA Bit in the Common Operating
Memory Area turns ON. When writing data to the PCU, make sure the WRITE
DATA Bit remains ON until the Data Transferring Flag turns ON.
Up to 600 words can be transferred during a single data write operation. The
maximum amount of data that can be transferred during a single CPU Unit
cycle, however, is 20 words. When more than 20 words of data are trans-
ferred, the data is divided and WRITE DATA is executed over multiple cycles.
When writing data to the PCU is completed, the Data Transferring Flag turns
OFF.
Common Operating Memory Area (Output)
n = CIO 1500 + (unit number
×
25)
Common Operating Memory Area (Input)
n = CIO 1500 + (unit number
×
25)
The following diagram shows the operation for writing data to the PCU.
Name Word Bit Contents
WRITE DATA Bit n 01 0
→
1: Starts writing data.
Number of write
words n+6 --- Specifies the number of words to be written
to the PCU. Up to 600 words can be trans-
ferred.
Write source area n+7 --- Specifies the area of the data to be written
to the PCU.
The type of area set as the write source
area is specified by specifying the begin-
ning word of the area in the write source
word in hexadecimal.
Write source area:
00B0 hex: CIO Area
00B1 hex: Work Area
00B2 hex: Holding Area
00B3 hex: Auxiliary Area
0082 hex: DM Area
005
@
hex: EM Area
@
: EM bank No.= 0 to 9, A, B, C
Write source word n+8 ---
Write destination
address n+9 --- Specifies the write destination address in
the PCU.
Name Word Bit Contents
Data Transferring
Flag n+15 14 0: Powerup, transfer completed, or transfer
failed
1: Transferring data
Unit Busy Flag n+16 14 0: PCU is not busy
1: PCU is busy