Section 5 Maintenance
FOUNDATION Fieldbus – CI852
3BSE 027 941 R301
133
The network
problem is
proving very
difficult to solve
(continued).
Use an oscilloscope to check the communication signals for
abnormalities.
•
The oscilloscope must be of differential or battery
operated type.
•
Probes must have a minimum of 1 MOhm input
resistance, and less than 1000 pF input capacitance.
Disconnect sections of the network, including the Ethernet port
via the PM8xx processor unit, until it is reduced to a size that
functions correctly.
•
A hand-held fieldbus master unit should be used to make
connections at different points in the network.
•
Locate the unserviceable section by reconnecting the
sections one at a time. In the worst possible case, it may
be necessary to remove devices one by one to identify the
faulty item.
•
Cables can be checked using the ohmmeter (resistance)
function of a digital voltmeter. Isolate the power supply
and disconnect all other devices before making the check.
•
For large networks, a network analyzer should be
employed. The analyzer must be suitable for use on
FOUNDATION Fieldbus networks.
Table 25. FOUNDATION Fieldbus CI852 – Fault-Finding (Continued)
Fault
Possible Cause and Corrective Action
Summary of Contents for AC 800M
Page 1: ...ControlIT AC 800M Version 2 1 Controller Hardware Hardware and Operation...
Page 2: ......
Page 3: ...Controller Hardware Hardware and Operation ControlIT AC 800M Version 2 1...
Page 10: ...7DEOH RI RQWHQWV 10 3BSE 027 941 R301...
Page 20: ...Related Documentation About This Book 20 3BSE 027 941 R301...
Page 26: ...Operating Environment Safety Summary 26 3BSE 027 941 R301...
Page 42: ...Product Release History Section 1 Introduction 42 3BSE 027 941 R301...
Page 108: ...Powering from an External 24 V DC Source Section 3 Configuration 108 3BSE 027 941 R301...
Page 118: ...Verification of Redundant CPU Section 4 Operation 118 3BSE 027 941 R301...
Page 212: ...Low Voltage Directive LVD Appendix D Directive Considerations 212 3BSE 027 941 R301...
Page 214: ...Hazardous Location Approval Appendix E Standards 214 3BSE 027 941 R301...
Page 228: ...QGH 228 3BSE 027 941 R301...
Page 229: ......