The monitoring signals generated by the self-monitoring function are recorded in the monitoring signal memory. The memory buffer allows for a maximum of 30 entries. If more than 29 monitoring signals occur without interim memory clearance, the SFMON: Overflow MT_RC signal is entered as the last entry. Monitoring signals prompted by a hardware fault in the unit are always entered in the monitoring signal memory. Monitoring signals prompted by a peripheral fault can be entered into the monitoring signal memory, if desired. The user can select this option by setting an “m out of n” parameter (see Chapter “Self-Monitoring (Function Group SFMON)”).

If at least one entry is stored in the monitoring signal memory, this fact is signaled by the red LED indicator H 3 on the local control panel. Each new entry causes the LED to flash (on/off/on....).

The monitoring signal memory can only be cleared manually by a control action. Entries in the monitoring signal memory are not cleared automatically, even if the corresponding test in a new test cycle now shows the P632 to be healthy. The contents of the monitoring signal memory can be read from the local control panel or through the PC or communication interface. The time and date information assigned to the individual entries can be read out through the PC or communication interface or from the local control panel.

The number of entries stored in the monitoring signal memory is displayed on the monitoring signal counter (MT_RC: No. monit. signals).