Analog input (AIN1) - Sign reversal on exceeding 12 V (eliminated as of OPERATING SYSTEM V8.3)
Eliminated as of:
ECS Application OPERATING SYSTEM as of V8.3
Behaviour of the new version?
Analog input 1 (AIN1) now also works correctly at signal voltages above 12 V.
Which products are affected?
ECS Application OPERATING SYSTEM <= V8.0
What happens?
The sign of the input signal in the controller changes suddenly from +100% to -100%, for example.
When does the problem occur?
If a voltage above 12 V is applied at the analog input.
Diagnostics options?
A sudden sign reversal occurs if the signal voltage at the analog input rises above 12 V.
Short-term measures/recommendations?
Set up the hardware component used so that a voltage range of +/-10 V is maintained for analog setpoint signals.
Evaluation:
In applications, the occurrence of a setpoint step-change can lead to unexpected drive movements.
The analog input is actually only intended for signal voltages of +/- 10 V. Signal voltages outside this range should not be encountered. Voltage sources for analog +/-10 V setpoint signals are usually also limited to +/-10 V.
CR Id: LDS00025840
Published with Service Message No. 2010/32
