16
Functions Section 1-2
• 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.
I/O Unit Connection Information
I/O Unit connection information
Error I/O Unit addresses Registered I/O Unit addresses
0 wd
+1 wd
1: Error (OR of bits 0 to 4)
1: Refreshing I/O
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
0 wd
Bit
Bit Flag name Meaning Content
15 Refreshing I/O Refreshing I/O 1: Communications between the
Communications Unit and I/O Units
is normal.
0: Communications error (no
response is received from an I/O
Unit)
14 Error OR of bits 0 to 4 1: Any one of bits 0 to 4 is ON
0: Bits 0 to 4 are all OFF
4 High-density
I/O Unit Error
A high-density I/O Unit error was
detected.
1: Unit error
0: Unit normal
3 I/O Unit Power
Supply Over-
load
An overcurrent to an I/O Unit
was detected.
1: Overcurrent detected
0: Normal
2 I/O Unit Inter-
face Error
An I/O Unit interface error was
detected.
Data Transfer Error:
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.
Too many I/O Units:
Nine or more I/O Units are
connected.
1: I/O Unit interface error
0: Normal
1 Configuration
Error
The I/O configuration was
changed when the Communica-
tions Unit was started.
1: I/O configuration change during
startup
0: No I/O configuration change during
startup
0 Special I/O
Unit Error
An error occurred in a Special
I/O Unit.
1: Special I/O Unit error
0: Special I/O Unit normal
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