Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 406)

8 Application Instructions API 100-149
DVP-PLC Application Manual 8-4
Registers for received data (responding messages)
Register DATA Explanation
D1070 low 01 H Address
D1071 low 03 H Function
D1072 low 04 H Number of data (counted by bytes)
D1073 low 17 H
D1074 low 70 H
Content of address 2102 H
D1075 low 00 H
D1076 low 00 H
Content of address 2103 H
D1077 low FE H CRC CHK Low
D1078 low 5C H CRC CHK High
Program Example 3:
1. In the communication between PLC and VFD-S series AC motor drive (ASCII Mode, M1143 = Off), retry when
communication time-out, data receiving error and sending address error occur.
2. When X0=On, PLC will read the data in VFFD-S data adress H2100 of device 01 and stores the data in ASCII
format in D1070 ~ D1085. PLC will automatically convert the data into numerals and stores them in D1050 ~
D1055.
3. M1129 will be On when communication time-out occurs. The program will trigger M1129 and send request to
M1122 for reading the data again.
4. M1140 will be On when data receiving error occurs. The program will trigger M1140 and send request to
M1122 for reading the data again.
5. M1141 will be On when sending address error occurs. The program will trigger M1141 and send request to
M1122 for reading the data again.
M1002
MOV H87 D1120
SET M1120
SET M1122
MOV K100 D1129
RST M1127
M1127
X0
MODRD K1 H2100 K 6
X0
M1129
M1140
M1141
RST M1129
Set up communication protocol to 9600, 8, E, 1
Set up communication instruction:
device address 01, data address
H2100
data length 6 words
Communication time-out Retry
sending address error Retry
receiving completed
handle received data
M1127
M1129
Retain communication protocol
Set up communication time-out: 100ms
Set up communication time-out: 100ms
Data receiving error Retry
Communication time-out. The flag is reset.
Sending/receiving of data is completed. The flag is reset.
The received data are stored in D1070~D1085 in ASCII
format. PLC will automatically convert the data into
numerals and store them in D1050~D1055.