Preventive Maintenance for Programmable Controllers
1. Introduction
The Programmable Controllers (PLC) that serve as the core of various control systems are composed of a large number of components. These components cannot be used indefinitely, and must be replaced when they have reached the end of their useful life. If a PLC should malfunction, considerable time is required to restore system operation and losses occur while the operation is stopped. To prevent PLC failures from occurring, we suggest that you consider a preventive maintenance program. Malfunctions can be prevented by replacing specific components shortly before wear-out failures (see section 2) begin to occur.
However, because there is also a possibility of early or random failures, we also recommend that you consider preparing spare parts to use as an emergency measure.
