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Programless Communications Section 5-1
■ If Not Operating Correctly
Check the following items if the operation is incorrect.
• Are the wiring and settings correct?
• Was the power cycled once the EJ1 and PLC settings were completed?
(The EJ1 settings are enabled only after the EJ1 is reset.)
Checking Operation
with MELSEC-Q/
QnAS Series
This section describes how to check operation for the configuration shown
below.
1,2,3... 1. Connect the EJ1 and PLC.
Connect the EJ1@-HFU and Serial Communications Unit as shown in the
following diagram.
DM Area Value Meaning Procedure step number and confirmation item
D00000 0000 Read Response Bits
D00001 0001 Setting Change Response Bits Step 3: Set to 0001 by the system.
D00500 0000 Read Request Bits
D00501 0001 Setting Change Request Bits Step 2: Set from PLC user program.
D00502 0000 Operation Command Request Bits
D00503 0000 Operation Command Code
D00504 0064 Channel 1 Set Point Step 1: Set from PLC user program.
D00505 0064 Channel 2 Set Point Step 1: Set from PLC user program.
MELSEC-Q/QnAS Series
EJ1
HFU EDU
TC
Unit
No. 0
RS-232C
ch1
Unit
No. 1
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