Cpu Bus Unit Area - Omron CJ - 08-2008 Operation Manual

CPU Bus Unit Area

Links to C200HX/HG/HE,
C200HS, and C200H PLCs
Link Area Initialization
1,2,3...
IOM Hold Bit Operation
9-5

CPU Bus Unit Area

384
Link Area words CIO 1000 to CIO 1063 in CJ-series PLCs correspond to Link
Relay Area words LR 00 to LR 63 for data links created in C200HX/HG/HE
PLCs. When converting C200HX/HG/HE, C200HS, or C200H programs for
use in CJ-series PLCs, change addresses LR 00 through LR 63 to their equiv-
alent Link Area addresses CIO 1000 through CIO 1063.
The contents of the Link Area will be cleared in the following cases:
1. The operating mode is changed from PROGRAM mode to RUN/MONITOR
mode or vice-versa and the IOM Hold Bit is OFF.
2. The PLC's power supply is cycled and the IOM Hold Bit is OFF or not pro-
tected in the PLC Setup.
3. The Link Area is cleared from a Programming Device.
4. PLC operation is stopped when a fatal error other than an FALS(007) error
occurs. (The contents of the Link Area will be retained if FALS(007) is ex-
ecuted.)
If the IOM Hold BIt (A50012) is ON and the PLC Setup's "IOM Hold Bit Status
at Startup" setting is set to protect the IOM Hold Bit, the contents of the Link
Area won't be cleared when the PLC's power supply is cycled.
If the IOM Hold BIt (A50012) is ON, the contents of the Link Area won't be
cleared when a fatal error occurs or the operating mode is changed from
PROGRAM mode to RUN/MONITOR mode or vice-versa.
The CPU Bus Unit Area contains 400 words with addresses ranging from
CIO 1500 to CIO 1899. Words in the CPU Bus Unit Area can be allocated to
CPU Bus Units to transfer data such as the operating status of the Unit. Each
Unit is allocated 25 words based on the Unit's unit number setting.
Data is exchanged with CPU Bus Units once each cycle during I/O refreshing,
which occurs after program execution. (Words in this data area cannot be
refreshed with immediate-refreshing, IORF(097) or FIORF(225) (CJ1-H-R
CPU Units only).)
CPU Bus Unit
CPU Unit
CPU Bus Unit Area
(25 words/Unit)
I/O re-
fresh-
ing
Section 9-5