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.
1
Internal supply
|
Voltage |
-50 mV ... +50 mV |
1 channel used |
|
Voltage |
-500 mV ... +500 mV |
1 channel used |
|
Voltage |
-1 V ... +1 V |
1 channel used |
|
Voltage |
-5 V ... +5 V |
1 channel used |
|
Voltage |
-10 V ... +10 V |
1 channel used |
|
Voltage |
0 V ... +5 V |
1 channel used |
|
Voltage |
0 V ... +10 V |
1 channel used |
The calculation of the resistor deviation must be performed via the bridge voltage by the PLC user program.