Patent ID: 11940472
Assignee: SIEMENS AKTIENGESELLSCHAFT
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for checking load circuits of a control system of an installation, the method comprising:
ascertaining reference current values at predefined voltage values of supply voltage or reference voltage values at predefined current values of a supply current for respectively predefined installation states, in a predefined installation state, at least one output channel being activated and a respectively associated load circuit being supplied with the predefined voltage values by the supply voltage or with the predefined current values by the supply current;
storing the reference current values ascertained for the predefined installation states or the reference voltage values ascertained for the predefined installation states;
measuring present current values at the respectively predefined voltage values of the supply voltage or present voltage values at the respectively predefined current values of the supply current on the at least one activated output channel for the respectively predefined installation states during a self-testing phase;
checking whether, in one of the predefined installation states, a departure from a predefined tolerance range occurs, when comparing the respectively presently measured current values with the respectively corresponding stored reference current values, by at least one of the predefined voltage values of the supply voltage or whether, in one of the predefined installation states, a departure from a predefined tolerance range occurs, when comparing the respectively presently measured voltage values with the respectively corresponding stored reference voltage values, by at least one of the predefined current values of the supply current; and
displaying the corresponding load circuit when, in one of the predefined installation states, a departure from the predefined tolerance range by at least one of the predefined voltage values of the supply voltage or by at least one of the predefined current values of the supply current is identified;
wherein the control system comprises at least two load circuits, at least one control unit and a clocked power supply via which the at least two load circuits, each having at least one load unit, are supplied with at least one of the supply voltage and the supply current via at least two output channels, control signals being made available by the control unit to actuate the at least two output channels.