Siemens ET 200M, Manual, Page: 36 / 284

Maintenance
Marshalled Termination Assemblies for ET200M Remote I/O Modules
36 A5E00482820-12
3.1 Tools and Test Equipment
The following tools and equipment are necessary for servicing:
• Common hand tools for servicing electronic equipment
• Digital Multimeter (DMM)
- Voltmeter Section:
o Ac/-0.01% of reading
o Resolution 1.0 mV input
o Impedance 10 M Ω
- Ammeter section:
o Ac/- 0.1% of reading
o Resolution 100 μ A
• Maintenance Kit, containing wrist strap and conductive mat.
3.2 Preventative Maintenance
The objective for establishing a preventive maintenance program is to provide
maximum operating efficiency.
Every preventive maintenance operation should assist in realizing this objective.
Unless a preventive measure reduces a station’s down time, it is unnecessary.
3.2.1 Environmental Consideration
The system has been designed to operate within specified environmental
parameters (temperature and humidity).
3.2.2 Visual Inspection
As part of a periodic maintenance program, the system should be visually
inspected. When viewing the MTA, scan for abnormalities such as loose, broken or
stressed cables. Look for damaged circuitry and heat stressed parts. Check for
excessive dirt or dust build-up which may impede air flow and inhibit proper heat
dissipation.