4 – 1
Chapter 4 Basic functions and System configuration
4.1
Selection of CPU module for compact remote system
There are three methods to use compact remote system by I/O assignment and compression mode selecting.
(1)
Normal remote method
(2)
Compression remote method
(3)
4W/4W method
Differences between these methods are shown in Table 4.1. I/O assignment of master module and compression mode
selecting determines the maximum mountable number of master modules on basic unit, the maximum number of
slave stations per master module, and maximum remote I/O points. Normal remote method has 256points per master
for remote I/O and free location of input modules and output modules on slave station. I/O assignment “REMOTE 2”
is supported by EHV-CPU16 to 128, EH-CPU516, and EH-CPU548. So, We recommend these CPU for compact
remote system. But in the case of using EH-CPU104A to 316A for cost reduction, please set “Word 4W/4W” for I/O
assignment for master module.
In the case of “Word 4W/4W” I/O assignment there is a disadvantage of not using internal inputs indicating remote
refresh cycle time and so on. But in this case there is an advantage of not limiting it to the number of mounting of
master modules per CPU. So, you can construct large-scale remote system with twisted pair cable by use many
master modules per CPU.
Table 4.1 Using method of compact remote for each CPU
CPU module
EHV-CPU16/32/64/128
，
EH-CPU516/548 EH-CPU104A/208A/316A
Using method of
compact remote
Normal remote
method
Compression
remote method
4W/4W method
4W/4W method
I/O assignment of master
REMOTE 2
WORD 4W/4W
WORD 4W/4W
I/O assignment of slave
X16, Y16,
Empty 16points
B1/1 for all slots
Unnecessary
Unnecessary
Number of mountable
master module
4 modules/CPU
Not limited
(according to CPU)
Not limited
(according to CPU)
Number of connectable
slave modules
8 modules / master
4 modules / master
4 modules / master
Number of occupied
channels in master
16 8 4
4
Input
Input 128 points
Input 64 points
Input 64 points
Number of
I/O points
Output
I/O 256 points
（
free location
）
Output 128 points
Output 64 points
Output 64 points
Master OFF
ON
OFF
OFF
Compression
mode setting
Slave OFF
ON
ON
ON
Special internal outputs for
remote function
Available (Note 1)
Available (Note 1)
Not available
Not available
Operation parameters for
remote function
Not available
Not available
Not available
Not available
Basic system
Section 4.3.1
－
Section 4.3.2
Section 4.3.2
Replace of H-200
Section 4.4.1
Section 4.4.2
－
－
Replace of large H
Section 4.5.1
，
4.5.3, and 4.5.4
－
Section 4.5.2
Section 4.5.2
Referen
ce
section
Replace of EM
Section 4.6.1
Section 4.6.2
(Note 1) Please refer to Section 6.2 for detail of special internal outputs for remote function
