Diagnostic Memory; A.2 Diagnostic Memory - Festo MSE6-E2M Original Instructions Manual

A General fundamentals on system parameterisation
A.2

Diagnostic memory

Fundamentals
A diagnostic memory serves for logging error states. Recording the time when errors occur and error
sequences facilitates the search for the cause of errors which are otherwise difficult to locate. If the
causes are eliminated, errors can be avoided in the long term.
Mode of operation
With the MSE6-E2M, the start and end of an error can be logged in the internal diagnostic memory. The
diagnostic memory contains up to 40 entries. In addition to information on localising the error, the rel­
evant time is saved, measured from the moment the power supply is switched on. A diagnostic entry
consists of 10 bytes. The first 5 bytes contain information on the time. The last 5 bytes contain informa­
tion on the fault (è C.4 Diagnostic memory data).
With the aid of the function number, entries in the diagnostic memory can be read out via
the I/O diagnostic interface, irrespective of the network protocol used. The various net­
work protocols provide, where applicable, further options for reading out and configuring
the diagnostic memory (è Description of CPX bus node).
108 Festo – MSE6-E2M-SY-EN – 1703d – English