SBAA551 June 2022 ADS8661 , ADS8665 , ADS8671 , ADS8675 , ADS8681 , ADS8685 , ADS8689 , ADS8691 , ADS8695 , ADS8699 , INA823 , INA826 , LM317L , LM337L , MUX509 , TPS2661 , TPS560430
Another important requirement of an analog input module is the ability to tolerate mis-wiring. A connection of the PLC supply voltage of up to ±33 V is tolerated (permanently) in voltage mode as the series resistors R3 and R8 (see Figure 2-1) limit the current into MUX. In current mode the TPS26611 limits the current to 30 mA, turns-off, and retries.
Setup | INx+ | IN0– | IIN INx+ | Comment |
---|---|---|---|---|
Positive voltage input overdrive ch 0 |
+30 V | GND | 4.1 mA | R3, R8 resistors limit current into MUX |
Negative voltage input overdrive ch 0 |
-30 V | GND | -4.1 mA | R3, R8 resistors limit current into MUX |
Positive current input overdrive ch 0 |
+30 V | GND | 30 mA | TPS26611 limits, turns-off and retries |
Negative current input overdrive ch 0 |
-30 V | GND | -30 mA | TPS26611 limits, turns-off and retries |