Omron CJ1W-PRT21 Operation Manual page 39

Connecting PC Components
!Caution Attach the End Cover to the Unit on the far right side of the Rack. An I/O bus
20
error will occur and the PC will not operate in either RUN or MONITOR mode
if the End Cover is not connected. If this occurs, the following information will
be set in memory.
Name
I/O Bus Error Flag
I/O Bus Error Slot Number
I/O Bus Error Rack Number
Note 1. Always turn OFF the power supply before connecting Units to each other.
2. Always turn OFF the power supply to the entire system before replacing a
Unit.
A maximum of 10 I/O Units can be connected to a CPU Rack or an Expansion
Rack. If 11 or more I/O Units are connected, and I/O overflow error will occur
and the PC will not operate in either RUN or MONITOR mode. If this occurs,
FALS(80E9) occurs, the Too Many I/O Points error flag (A40111) will turn ON
and A40713 to A40715 (I/O Overflow Details) will turn ON (see Appendix B
Device specific parameters and diagnostics ).
Address
A 40114
A40400 to A40407
A40408 to A40415
Section 3-2
Status
ON
0E Hex
0E Hex