Process for testing and ensuring the availability of a networked system

A method for testing and safeguarding an availability of a networked system assigned to a system carrier, subscribers to the networked system exchanging data via at least one line, at least individual subscribers transmitting data via at least one line when specific voltage levels are applied to the at least one line by appropriate subscribers, and the data being evaluated by at least one subscriber utilizing voltage levels wherein the at least one line is monitored by the at least one subscriber for one of an overshoot and an undershoot of the voltage levels, the method comprising the acts of:

• transmitting signals at a voltage level which is displaced in comparison to normally transmitted data to check an operability of data-receiving subscribers;
• determining a displacement measure where at least individual subscribers can no longer receive data;
• and
• storing in at least one status map, with respect to the individual data-receiving subscribers, status data representing at which displacement measure of the voltage level at least individual subscribers can no longer receive data and/or at which further displacement measure of the voltage level at least one subscriber can still receive data.

A method for testing and safeguarding an availability of a networked system assigned to a system carrier, subscribers to the networked system exchanging data via at least one line, at least individual subscribers transmitting data via at least one line when specific voltage levels are applied to the at least one line by appropriate subscribers, and the data being evaluated by at least one subscriber utilizing voltage levels wherein the at least one line is monitored by the at least one subscriber for one of an overshoot and an undershoot of the voltage levels, the method comprising the acts of:

• transmitting signals using at least one data-transmitting subscriber to check an operability of the data-transmitting subscribers;
• checking a deviation of a voltage level of received signals from a desired signal voltage level during a normal transmission of data;
• and
• storing a value referring to the deviation voltage level of the received signals, referenced to individual data-transmitting subscribers, in at least one status map;
• and deciding that the reference-earth potential of a subscriber is displaced, when the value referring to the deviation voltage level exceeds a threshold.

Method for testing and safeguarding the availability of a databus system assigned to a system carrier, in which a multiplicity of subscribers exchange data via a bus-type network comprising one or more lines, at least individual subscribers transmitting data via the line or the lines by virtue of the fact that specific voltage levels are applied to the line or the lines by the appropriate subscribers, and the data being evaluated in at least one receiving subscriber with the aid of voltage levels by virtue of the fact that based on a signal criterion the line or the lines is or are monitored by the at least one receiving subscriber for the overshooting or undershooting of voltage levels, characterized in that during operation of the system signals present on the bus-type network (BUS_H, BUS_L) are discriminated or tested or measured with respect to at least said one signal criterion by individual subscribers under conditions defined in a network-wide fashion for all subscribers (ECU1 to ECU8), characteristic status data being generated in each case for each signal criterion with respect to each subscriber and being collected and arranged in at least one status map (SMP) of the system, these status data characterizing both the current status and at least one earlier status with regard to the tested subscribers (ECU1 to ECU8) with respect to the at least one criterion, and in that at least one measure of the degree of error of the databus system with respect to the at least one criterion is obtained from these status data.

Method for testing and safeguarding the availability of a databus system assigned to a system carrier, subscribers of this network exchanging data via one or more lines, at least individual subscribers transmitting data via the line or the lines by virtue of the fact that specific voltage levels are applied to the line or the lines by the appropriate subscribers, and the data being evaluated by at least one subscriber with the aid of voltage levels by virtue of the fact that the line or the lines is or are monitored by the at least one subscriber for the overshooting or undershooting of voltage levels, characterized in that the operability of data-receiving subscribers (ECU) is checked by virtue of the fact that signals are transmitted at a voltage level which is displaced by comparison with the normal transmission of data and, furthermore, it is checked at which measure of the displacement (US) of this voltage level at least individual subscribers can no longer receive data and in that at least one status map (SMP) is drawn up in which it is stored (B)—with reference to the individual data-receiving subscribers—in the form of status data at which displacement (US) of said voltage level at least individual subscribers can no longer receive data and/or at which (further) displacement of said voltage level which subscriber or subscribers can, as a last one or ones, still receive data.