Omron DEVICENET#05-2003 Operation Manual page 29

Functions
I/O Unit Connection Information
0 wd
16
• Error I/O Unit addresses
As shown in the following diagram, the status consists of two words. The first
two words of the Communications Unit allocation input area in the CPU Unit
are allocated for this status. Include a program section in the CPU Unit to
check this status and perform error processing.
1: Error (OR of bits 0 to 4)
1: Refreshing I/O
Bit Flag name
15 Refreshing I/O Refreshing I/O
14 Error OR of bits 0 to 4
4 High-density A high-density I/O Unit error was
I/O Unit Error detected.
3 I/O Unit Power An overcurrent to an I/O Unit
Supply Over- was detected.
load
2 I/O Unit Inter- An I/O Unit interface error was
face Error detected.
Data Transfer Error:
Too many I/O Units:
1 Configuration The I/O configuration was
Error changed when the Communica-
tions Unit was started.
0 Special I/O An error occurred in a Special
Unit Error I/O Unit.
0 wd
I/O Unit connection information
+1 wd
Error I/O Unit addresses
Bit
1: Special I/O Unit Error
1: Configuration Error
1: I/O Unit Interface Error
1: I/O Unit Power Supply Overload
1: High-density I/O Unit Error
Meaning
In the I/O Unit interface, there
was no response to a com-
mand after the fixed time has
elapsed. Alternatively, the
response expected to be
returned from the end I/O Unit
(terminator) was not received.
Nine or more I/O Units are
connected.
Section 1-2
Registered I/O Unit addresses
Content
1: Communications between the
Communications Unit and I/O Units
is normal.
0: Communications error (no
response is received from an I/O
Unit)
1: Any one of bits 0 to 4 is ON
0: Bits 0 to 4 are all OFF
1: Unit error
0: Unit normal
1: Overcurrent detected
0: Normal
1: I/O Unit interface error
0: Normal
1: I/O configuration change during
startup
0: No I/O configuration change during
startup
1: Special I/O Unit error
0: Special I/O Unit normal