| Data Sheet Extract | Caledon | ![]() |
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| INSTRUMENTS | MODBUS RTU TRUE RMS CURRENT AND VOLTAGE DATA ACQUISITION MODULE | ||
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| DIN rail mounted | ||
| MODBUS RTU Slave | ||
| True RMS readings | ||
| Suitable for load monitoring with phase angle or burst fire control | ||
| 24V DC power supply | ||
| Galvanically isolated comms port | ||
| For use with either 1A or 5A Current transformer secondaries | ||
The module accepts 3 current inputs, 3 non-isolated single ended voltage inputs, and 3 (transformer) isolated voltage inputs. The module acts as a Modbus RTU slave, with a galvanically isolated communications port. The port may be connected either as RS422 with separate Tx and Rx pairs, or RS485 with a single pair for Tx and Rx
Two sets of values are transmitted for each voltage or current signal:-
We should be pleased to consider custom variants of this module - please let us know your requirements
A version with DeviceNet communications is also available.
Power Supply
The module requires a nominal 24V DC power supply, limits of range 20 to 28V. The supply should be fitted with a 250mA fuse. Current consumption is nominally 120mA
Enclosure
DIN rail mounted enclosure with clear polycarbonate cover, size 220mm long x 110mm high x 80mm deep when mounted on 35 x 8 mm symmetrical DIN rail.
Electrical connections are to screw terminals, with rising clamp connectors, suitable for cables up to 2.5mm2.
Environmental
0-50oC operating temperature range. 0-95% RH, non condensing.