ICP DAS USA U-7500 Series, User Manual

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OPC UA I/O Series User Manual V4.0 – ICP DAS
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G
roup Setting example: Check “Enable” of “JSON Format”
Here is an example of the lighting control in a factory. Use the I/O points of the U-7555M module to
connect the light switches of Room 1 to 7 in the factory Building-A to monitor/control the on/off of the
room lights. We want to use the
Group Setting , so check "Enable" of the " JSON Format ". The following
is a parameter example for the settings of [MQTT Setting] > [Client Setting] .
The Pub & Sub setting page when enable the JSON Format: Sending/Reading the JSON string
Note:
When setting the Pub/Sub of MQTT Client,
please also set the Alias of I/O channel,
which includes MQTT Alias and OPC UA
Description.
MQTT Client setting should cooperate
with MQTT Alias of the I/O channels
for the accuracy/readability of
MQTT communication settings.
Menu:
【
Module Setting
】
>
【
I/O Setting
】
As shown on the right.
1. Set the update frequency for the task data (1000 ms)
2. Do not set the Dead Band, so keep 0.
3. Set disconnect Topic for 1F of Building-A (U-7555M)
4. Set Will message: Disconnection
5. Check to Enable JSON format to enter the Pub/Sub
screen page for Group setting.
5. Check to set the Broker retain the message
1. Topic of the publish JSON string:
/Build-A/1F/U-7555M/all I/O sending data
3. Topic of the subscribe JSON string:
/Build-A/1F/U-7555M/all I/O reading data
4. Set QoS to level 2 for subscribe. 2: exactly once
2. Set QoS to level 2 for publish. 2: exactly once
6. Save all settings of this page.