Connection of a resistance measuring bridge with internal supply

When resistance measuring bridges are connected, the short-circuit-proof voltage output (internal supply) at pin I0A (or I2A, I4A, I6A) must be used. This supply voltage is activated as soon as “Voltage Measurement” is configured for the relevant channel.

The following figure shows the connection of a resistance measuring bridge with internal supply.

Connection of a resistance measuring bridge with internal supply. 1 analog sensor requires 2 channels.

All voltage measuring ranges can be configured AI531 Analog Input Module AI531 Analog Input Module.

The calculation of the resistor deviation must be performed via the bridge voltage by the PLC user program.