8 MODBUS
25
8.7.6
Click the “Advanced” button in the lower right corner of the page. For the A8812 onboard IO,
there are several options.
Input types:
This list shows the status of the 8 analog inputs, either 0-10V, 4-20mA, resistance, pulse,
status, etc.
The
Contact Closure Threshold
allows you to set a maximum resistance to be counted as a “closed”
contact. This is helpful when using intrinsic barrier devices.
The
Contact Open Threshold
can be used in conjunction with a 20K resistor in parallel with the contact
closure. When the contact is open, the Energy Monitoring Hub will read 20K, when closed, it will read
<100 ohms. If the wire is broken, the reading will go above 20K ohms, and will cause an alarm condition.
The
Pulse count for instantaneous rate
value specifies the number of pulses to use to calculate the
instantaneous rate, min, and max fields in pulse mode.
8.7.7
After returning to the device configuration page, click “Save” at the bottom of the page to return
to the device display page.
The internal I/O device 250 is also available to the Modbus TCP gateway feature. External systems such
as computer software or PLC may send a Modbus TCP query to the Energy Monitoring Hub using Modbus
address 250. The internal I/O device will respond with Modbus registers that represent all of the features
seen in the Energy Monitoring Hub configuration pages. Complete documentation of the Internal IO device
250 Modbus registers is available online on the website Leviton .com in the A8812 overview section.
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