| 摘要 |
The invention relates to logic systems used for controlling industrial processes and consists in a monitoring apparatus for checking the regularity of the operation of a logic system, in order to increase its safeness. The apparatus comprises a source of a clock signal, a series of comparison units for comparing logic signals, a detecting device including a counter for checking the presence of the clock signal at the output of the series of comparison units, a checking system means for simulating an alarm state and consent system for making the operation of the logic system depend on the working conditions of the monitoring apparatus. The invention is particularly useful for increasing the safeness of the operation of logic systems for machine tools. |
