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Memory Allocation
4-1
Memory Allocation
Memory Allocation
C200H PC
IR area
Unit#0 IR100 to IR109
Unit#1 IR110 to IR119
Unit#2 IR120 to IR129
Unit#3 IR130 to IR139
Unit#4 IR140 to IR149
Unit#5
IR150 to IR159
Unit#6 IR160 to IR169
Unit#7 IR170 to IR179
Unit#8 IR180 to IR189
Unit#9 IR190 to IR199
Selecting Allocated Data
34
According to the Unit number switch setting on the front of the C200H PID Con-
trol Unit, 10 words are allocated for each Unit number in the Special I/O Unit IR
area between IR100 to IR199, which is used as the I/O refresh data area. The IR
area used by the C200H PID Control Unit is refreshed on each C200H PC I/O
refresh scan.
OUT
IN
During PC I/O refresh, each
scan is executed for the out-
puts (PC to PID Control Unit)
followed by the inputs (PID
Control Unit to PC).
Note A Duplicate I/O Unit error occurs if the set Unit number corresponds to the num-
ber of an existing Special I/O Unit.
The data allocated to each IR word due to the Unit number setting is determined
by the setting of SW2-1 on the front of the Unit.
ON
Normal
OFF
Fixed
This setting becomes valid immediately when the switch is set.
PID Control Unit
I/O refresh data area
Wd (n)
to
Wd (n+2)
Wd (n+3)
to
Wd (n+9)
(n=100 + 10 x Unit number)
The terms "output" and "input" are de-
fined from the C200H PC side.
All data can be set using commands.
Parameters are fixed for the set point (SV).
Section 4-1
Output
refresh
Input
refresh
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