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Programless Communications
Section 5-1
■
Checking Programless Communications Operation from the PLC
To confirm that programless communications are working from the PLC, con-
firm that reserved bit 15 of the Communications Status under the Programless
Upload Settings is changing. Bit 15 repeatedly turns ON/OFF during commu-
nications. Bit 15 alternates between ON and OFF, changing at each program-
less communications.
Example: Multi Read
Each time all the parameters set under Programless Upload Settings are
written to the PLC, bit 15 changes between ON and OFF.
Setting Changes
To change EJ1 settings from the PLC, first change the values in the Download
Area in the PLC memory and then set the Setting Change Request Bits.
The EJ1 will then read the Download Area in the PLC memory and change
the corresponding settings.
• Single Action
All of the parameters set in the Download Area are written.
Upload Area
Download Area
Value
Address
Value
Address
m+0
m+1
m+2
m+4
···
n+0
n+1
n+2
n+4
m+3
n+3
PLC
Upload Area
Download Area
Value
0001
0001
Operation Command
Response Bits
Address
Value
Address
m+0
m+1
m+2
m+4
···
n+0
n+1
n+2
n+4
Operation Command
Request Bits
yyyy
Communications
Status
m+3
n+3
Operation
Command Code
PLC
EJ1
HFU
TC4/2
yyyy
yyyy
Read Response
Bits
Monitor Value
Read Request Bits
0000
0000
Operation Command
Response Bits
Operation Command
Request Bits
yyyy
Communications
Status
Operation
Command Code
Read Response
Bits
Monitor Value
Read Request Bits
4. The EJ1 sets the Setting
Change Response Bits.
6. The EJ1 clears the Setting
Change Response Bits.
5. The Setting Change Request
Bits are cleared by the PLC.
2. The Setting Change Request
Bits are set by the PLC.
3. The EJ1 reads the
set value.
1. Set value is changed by
the PLC.
Summary of Contents for EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
Page 305: ......