Omron CP1L CPU UNIT - 03-2009, Operation Manual

Page: 187 / 810

153
Serial PLC Link Area Section 4-4
4-4 Serial PLC Link Area
The Serial PLC Link Area contains 1,440 bits (90 words) with addresses rang-
ing from CIO 3100.00 to CIO 3189.15 (CIO 3100 to CIO 3189).
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.)
4-5 Internal Work Area
The Internal Work Area contains 512 words with addresses ranging from W0
to W511. These words can be used in programming as work words.
There are unused words in the CIO Area (CIO 3800 to CIO 6143) that can
also be used in the program, but use any available words in the Work Area
first because the unused words in the CIO Area may be allocated to other
applications when functions are expanded.
Forcing Bit Status Bits in the Work Area can be force-set and force-reset.
Work Area Initialization The contents of the Work Area will be cleared in the following cases:
1. When the operating mode is changed from PROGRAM to RUN or MONI-
TOR mode or vice-versa and the IOM Hold Bit is OFF
2. When the power is cycled
3. When the Work Area is cleared from the CX-Programmer.
CP1L CPU
Unit
CP1L CPU
Unit
CJ1M CPU
Unit
RS-232C
port
RS-232C
port
Serial PLC Link
Serial PLC
Link Area
RS-232C
port