Omron CP1H-CPU - 05-2006, Operation Manual

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Serial PLC Link Area
Section 4-7
Special I/O Unit Area
Initialization The contents of the Special I/O Unit Area will be cleared in the following
cases:
1. When the operating mode is changed from PROGRAM mode to
RUN/MONITOR mode or vice-versa and the IOM Hold Bit is OFF
2. When the power is cycled
3. When the Special I/O Unit Area is cleared from the CX-Programmer
4. When PLC operation is stopped when a fatal error other than an
FALS(007) error occurs (The contents of the Special I/O Unit Area will be
retained when FALS(007) is executed.
4-7 Serial PLC Link Area
The Serial PLC Link Area contains 90 words with addresses ranging from
CIO 3100 to CIO 3189 (bits CIO 3100.00 to CIO 3189.15). Words in the Serial
PLC Link Area can be used for data links with other PLCs.
Serial PLC Links exchange data among CPU Units via the built-in RS-232C
ports, with no need for special programming.
The Serial PLC Link allocations are set automatically by means of the follow-
ing PLC Setup in the Polling Unit.
• Serial PLC Link Mode
• Number of Serial PLC Link transfer words
• Maximum Serial PLC Link unit number
Addresses not used for Serial PLC Links can be used in programming, the
same as the Work Area.
Forcing Bit Status Bits in the Serial PLC Link Area can be force-set and force-reset.
Serial PLC Link Area
Initialization The contents of the Serial PLC Link Area will be cleared in the following
cases:
1. When the operating mode is changed from PROGRAM mode to
RUN/MONITOR mode or vice-versa and the IOM Hold Bit is OFF
2. When the power is cycled
3. When the Serial PLC Link Area is cleared from the CX-Programmer
4. When PLC operation is stopped when a fatal error other than an
FALS(007) error occurs (The contents of the Serial PLC Link Area will be
retained when FALS(007) is executed.)
CP1H CPU
Unit CP1H CPU
Unit
CJ1M CPU
Unit
RS-232C
port RS-232C
port
Serial PLC Link
Serial PLC
Link Area
RS-232C
port