Hydro WQM-100, Instruction Manual

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TABLE 2: Circuit Board Descriptions and Node Numbers
Node Number
(Comm Error)
Circuit Board Board Description Application
1 MB128 pH/ORP1, Temp1, PV1
Probe #1 (pH or ORP), Temp
and Flow mA input
2 MB128
pH/ORP2. Temp2 Probe #2 (pH or ORP)
2 MB130
Cond2, Temp2 Probe #2 (Conductivity)
3 MB128
pH/ORP3, Temp3 Probe #3 (pH or ORP)
3 MB130
Cond3, Temp3 Probe #3 (Conductivity)
4 MB128
pH/ORP4, Temp4 Probe #4 (pH or ORP)
4 MB130
Cond4, Temp4 Probe #4 (Conductivity)
5 MB114
Four Analog Outputs Board 4-20mA outputs
6 MB104
Four Relay Board Relay outputs
- MJ500
Real-time Clock Data Logger
Communication Errors
The MB410 Display board is communicating with the other boards by Modbus over the ribbon cable.
If the ribbon cable is not properly connected to each board, then the MB410 Display board may lose
communication with one or more circuit boards. If so, you would see a “COMM ERROR” message
such as “Node 1 Error”. Node numbers are identifi ed on Table 2 below. As can be seen there, the
MB128 board is Node 1. If such an error occurs, check to ensure that the ribbon cable is properly
connected to all relevant circuit boards per Figure 8.
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