Memory Allocation
Section 4-2
61
4-2
Memory Allocation
4-2-1
Memory Mapping
The following figure shows how the 34 words in the Special I/O Unit Area (CIO)
and the 90 reserved words in the Special I/O unit DM Area (DM) are mapped in the
memory of the CPU-Unit.
An Indirect Address at the end of every Counter specific block in DM specifies
where the Range or Comparison Data of the corresponding Counter is allocated.
General
n
Counter 1
n+3
n+1
CIO Memory Mapping Output Words
(Refer to 4-2-3 for details)
General
n+17
n+13
Not used
n+39
DM-Memory Mapping
(Refer to 4-2-4 for details)
General
m+9
m
Counter 1
m+29
m+10
m+90
Free DM
m+399
Indirect Address k1
Counter 2
m+49
m+30
Indirect Address k2
k1
k2
n = CIO 2000 + (Nx10)
N = Machine Number
m = D 20000 + (Nx100)
N = Machine Number
k1, k2, k3, k4 = Any available address in DM/EM
CIO Memory Mapping Input Words
Range Memory Mapping
(Refer to 4-2-5 for details)
Comparison Memory Mapping
(Refer to 4-2-6 for details)
(Refer to 4-2-2 for more details about Indirect Addressing)
Range / CV Settings
Counter 3
k3
k4
Range / CV Settings
Counter 2
Range / CV Settings
Counter 1
Range / CV Settings
Counter 4
Counter 3
m+69
m+50
Indirect Address k3
Counter 4
m+89
m+70
Indirect Address k4
(Refer to 4-2-3 for details)
Counter 2
Counter 3
Counter 4
n+6
n+4
n+9
n+7
n+12
n+10
Counter 1
n+18
n+21
Counter 2
n+22
n+25
Counter 3
n+26
n+29
Counter 4
n+30
n+33
n+34
