Moxa Technologies MGate 5105-MB-EIP Series - Status Monitoring

MGate 5105-MB-EIP Series User Manual
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Status Monitoring
The Status Monitoring function provides status information of field devices when the MGate is being used as
a master/client. If a slave device fails or a cable comes loose, generally the gateway won’t be able to
receive up-to-date data from the slave device. The out-of-date data will be stored in the gateway’s memory
and will be retrieved by the master device (e.g., PLC), which will not be aware that the slave device is not
providing up-to-date data. The MGate supports the Status Monitoring function, which provides a warning
mechanism to report the list of slave devices that are still “alive.”
The MGate 5105 allocates one bit of the gateway’s specified memory address to show the status of each
Modbus command as being normal or abnormal. If a command has run successfully, the status value will
continuously be 1. On the contrary, if a command has failed, the status will be set to 0. In this case, the
master device will know the failure status of the slave device.
Modbus RTU/ASCII/TCP
EtherNet/IP
Method
Modbus function code:
0x03 or 0x04
Through UCMM with Class ID 0x405, Instance ID 1,
Attribute 0.
Data address
60000
Data unit
word byte
While using the MGate 5105 for data exchange between MQTT/Cloud and fieldbus protocols, the MGate
5105 also supports the Tag Status Monitoring function to identify the status of the fieldbus devices. By
enabling the Tag Status Monitoring function within Pair Settings session under the Message settings
process, the northbound message will include the validTag value to represent the status of the fieldbus
device. Then, enable the Tag Status Timeout function within Advanced Settings under each MQTT/
Cloud Setting page with a specified timeout period. The Tag Status Monitoring function will then be
activated successfully. If a command has run successfully, the tag status value will continue to be 1.
However, if a command has failed under specified Tag Status Timeout period , the status will be set at 0. In
this case, the MQTT broker/cloud will notice the failure status of the slave device.