70
Monitoring via AR Bits
Bit
Function
AR 2200 to AR 2211
A 3-digit BCD number indicating the first word of an I/O
Unit that is being changed on-line.
AR 2212 to AR 2214
A 3-bit number indicating the number of words occupied
by the I/O Unit that is being changed on-line.
AR 2215
On-line I/O Unit Change Flag.
Key Sequence
I/O table read in progress
[I/O Unit removal]
[I/O Unit mounting]
Example
After mounting the I/O Unit
Indicates that the I/O
Unit can be changed.
Prior to I/O Unit removal
00000I/OTBLEXCHG
0-1U=0*** 001
00000 UNIT XCHG?
0-1U=0*** 001
00000 EXCHG DEL?
0-1U=0***10001
00000I/OTBLEXCHG
0-1U=0*** 001
00000I/OTBLEXCHG
0-1U=0*** 001
00000 UNIT XCHG?
0-1U=0*** 001
00000 EXCHG END?
0-1U=0*** 001
00000I/OTBLEXCHG
0-1U=0*** 001
•
The outputs of the I/O Unit will turn ON for an instant (causing the I/O Unit’s
LEDs to blink) when replacing an I/O Unit on-line. Be sure to disconnect the
terminal block before removing the Unit. After mounting the new I/O Unit,
be sure to reconnect the terminal block.
4-5-8
Verifying the I/O Table
The I/O Table Verification operation is used to check the I/O table registered
in memory to see if it matches the actual sequence of I/O Units mounted.
The first inconsistency discovered will be displayed as shown below. Every
subsequent pressing of
VER
displays the next inconsistency.
Preparation for Operation
Section 4-5
