OPERATION MANUAL CompoBus/S

I/O Link Units for CPM2C Section 5-10
Allocation to CPM2C I/O
Bits
334
I/O Memory of the CPU Unit in which the CompoBus/S Master Unit is
mounted.
As with other Expansion I/O Units for the CPM2C, both input and output bits
for the I/O Link Unit start with the word following the last word allocated to the
CPM2C CPU Unit or the previous Expansion I/O Unit to which it is connected.
If the last input word allocated to the CPM2C CPU Unit or the previous Expansion
Unit is word m, and the last output word allocated to that Unit is word n,
word allocations are as shown in the following figure.
I/O Link Unit for CPM2C
Input word m+1
Output word n+1
CompoBus/S Master Unit (SRM1
CompoBus/S Master Control Unit
or CPM2C-S Series)
CPM2C CPU Unit
CompoBus/S Communications Cable
(Special flat cable or VCTF cable)
CPM2C-SRT21 I/O
Link Unit for
CPM2C
An I/O Link Unit for the CPM2C Series can be connected to the first 20-point I/
O CPM2C CPU Unit as shown in the following figure.
CPU Unit
(with 20 I/O
points)
Word m+1
CompoBus/S communications
error
0: Normal
1: Error
CompoBus/S communications
0: Not in communication
1: In communication
Word n+1
Input number
IR 000
Output number
IR 010
---: Used for AR bits
Input number
IR 001
Output number
IR 011
Data from Master
---: Not used for AR bits
Transmission data to Master
CPM2C-SRT21 I/O
Link Unit for
CPM2C
Note 1. Data transmissions are not synchronized for all 8 I/O points. Eight-point
data simultaneously output from the Master CPU will not always reach the
CPM2C CPU Unit simultaneously. Eight-point data simultaneously output
from the CPM2C CPU Unit will not always reach the CPU Unit of the Master
simultaneously. If 8-point data needs synchronization, write the ladder