Consider the simple system featuring Remote I/O shown below. The DL250–1 or DL260’s
built-in Remote I/O channel connects to one slave base, which we will assign a station
address=1. The baud rates on the master and slave will be 38.4KB.
We can map the remote I/O points as any type of I/O point, simply by choosing the
appropriate range of V-memory. Since we have plenty of standard I/O addresses available (X
and Y), we will have the remote I/O points start at the next X and Y addresses after the main
base points (X60 and Y40, respectively).
Remote I/O Setup Program
Using the Remote Slave Worksheet shown above can
help organize our system data in preparation for writing
our ladder program (a blank full-page copy of this
worksheet is in the Remote I/O Manual). The four key
parameters we need to place in our Remote I/O
configuration table are in the lower right corner of the
worksheet. You can determine the address values by
using the memory map given at the end of Chapter 3,
CPU Specifications and Operation.
The program segment required to transfer our worksheet
results to the Remote I/O configuration table is shown
to the right. Remember to use the LDA or LD
instructions appropriately.
The next page covers the remainder of the required
program to get this remote I/O link up and running.
DL205 User Manual, 4th Edition, Rev. B
4–30
Chapter 4: System Design and Configuration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
A
B
C
D
LDA
O40403
OUT
V37704
LD
K16
OUT
V37705
SP0
DirectSOFT
LDA
O40502
OUT
V37706
LD
K16
OUT
V37707
Slave 1
Input
Slave 1
Output
Slot
Number
Module
Name Input Addr. Output Addr.
INPUT OUTPUT
No. Inputs No.Outputs
Remote Base Address _________(Choose 1–7)
Remote Slave Worksheet
1
2
3
4
5
6
7
0
Input Bit Start Address: ________V-Memory Address:V _______
Output Bit Start Address: ________V-Memory Address:V _______
Total Input Points _____
Total Output Points _____
0
8ND3S
08ND3S
0
8TD1
0
8TD1
1
X
060
X070
8
8
Y040
Y050
8
8
X060
Y040
16
16
40403
40502
Main Base with CPU as Master
DL
C
PU
Remote Slave
X0-X17 X20-X37 X40-X57 Y0-Y17 Y20-Y37
V
40400 V40401 V40402 V40500 V40501
X60-X67
V40403
X70-X77 Y40-Y47 Y50-Y57
V40502
D
RSSS
Slave
Port 2
16
I
16
I
16
I
16
O
16
O
8
I
8
I
8
O
8
O
V40403 V40502
260
2
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