Modbus Self-Diagnosis; Communication Terminal Connection For Self -Diagnosis Function - YASKAWA F7 User Manual

http://www.aotewell.com

Modbus Self-Diagnosis

The Drive has a built-in function for self-diagnosing the operations of the serial communication interface circuits. The
self-diagnosis function tests the serial communications hardware of the Drive by jumpers the send and receive terminals to
receive the same message as the Drive sends.
Perform the self-diagnosis function using the following procedure.
1. Turn ON the power supply to the Drive, and set parameter H1-05 (Terminal S7 function selection) to 67 (communication
test mode).
2. Turn OFF the power supply to the Drive.
3. Jumper the following terminals while the power supply is turned OFF (see diagram below):
Connect S+ to R+.
Connect S- to R-.
Connect S7 to SN.
4. Turn ON the terminating resistor. (Turn ON pin 1 on DIP switch 1).
5. Turn ON the power supply to the Drive again.
SN SC SP
S1 S2 S3
E(G)
6. During normal self-diagnostic operation, the Digital Operator displays the frequency reference value. If an error occurs, a
CE (Modbus communication error) alarm will be displayed on the Digital Operator, the fault contact output will be turned
ON, and the Drive operation ready signal will be turned OFF.
Tel: +(86) 755 8660 6182
A1 A2 +V AC -V
S4 S5 S6 S7 S8
Fig D.10

Communication Terminal Connection for Self -Diagnosis Function

Aotewell
A3 MP AC RP R+
FM AC AM IG S+
Communications D - 18
Aotewell
Email: Sales@aotewell.com
R- M5 M6 MA MB
S- M3 M4 M1
http://www.aotewell.com
MC
M2
E(G)