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Can the load setpoint (kW) be written via Modbus registers?

2026-04-03

Yes. The resistive load setpoint (kW) can be written into a Modbus holding register.
The PLC will control the load accordingly.
Note: Fan power consumption is additional to the resistive load.

Is the PLC accessible via Modbus TCP and acting as a slave/server?

Do fans need to be controlled via Modbus?

Related questions

The PLC can be connected via Ethernet (RJ45)? Is it a standard 100 Mbps connection?

Yes. The PLC inside the load bank is connected to an industrial Ethernet switch (PoE type), supporting a standard 100 Mbps Ethernet connection.
The upper-level PC/SCADA system can connect directly to the RJ45 port of this switch.

What protection functions does our Resistive/Liquid Cooled/Rack Mounted /Resistive-Inductive load bank feature?

Protections include:

Overtemperature
Low airflow
Fan overload

Interlock: Local/Remote mode selection (mutually exclusive)

Are there any additional operating steps after the load is energized?

Switch control mode to Remote
Start fans

Can you provide Modbus register list in advance?

The register list will be provided after production is completed.

How long do fans run after stop?

Approximately 5 minutes (controlled by PLC timer).

How long does it take to start?

Fans start: < 500 ms
Contactor response: 50–150 ms

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Rata Load Banks

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