Omron E5AF, Operation Manual

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4--8 E5AF-A20: Application Example #2
The following example describes the connections and programming required
to transfer set values and process values between the E5AF-A20 and the
PC.
4--8--1 Hardware Configuration
E5AF-A20
IR 003: Read data from E5AF to PC
IR 004: Write data from PC to E5AF
Heater
7-segment display
Display for data read from the E5AF
Thumbwheel switches to
input set value for E5AF
Read/write control switch
(IR 00208)
VAL control switch
(IR 00215)
Execution control switch (IR 00200)
IR 005 output
to display
(DM 0505: read
data from E5AF)
IR 000 input
from switches
PC
0 V
(DM 0501: write
data for E5AF)
The program provided in this section operates as follows:
1, 2, 3... 1. When the VAL control switch is ON, the E5AF-A20 is ready to process
communications.
2. When the read/write control switch is ON, data will be written to the
E5AF-A20. When this control switch is OFF, data will be read from the
E5AF-A20.
3. Select codes 04 through 07 (set value 1) are used to write data and se-
lect codes 20 through 23 are used to read data (the process value).
4. Each time the DSL (data select code) switch is turned ON, the E5AF-
A20 increments the select code and read/writes one digit (of the 4 dig-
its).
5. Read data is displayed on a 7-segment display and write data is input
via thumbwheel switches.
Program Operation
)*$+,- & .+
Section 4--8