Diagnostics Channel In Transfer Mode - Festo VTEM Original Instructions Manual

2 Function
2.7.3

Diagnostics channel in transfer mode

By means of the transfer mode, the Motion Terminal provides diagnostic information which, together with the
CPX error number, enables more precise analysis of the cause of the malfunction
(è D Diagnostics using transfer mode).
2.7.3.1 Errors and warnings
The Motion Terminal distinguishes between 2 classes of malfunction:
– Error
– Warning
Error
A malfunction classified as an error is so serious that the Motion app currently running is automatically stopped or
a Motion app is prevented from starting. After eliminating the cause of the error, the error must be acknowledged
before it is possible to start a Motion app (è 2.7.3.6 Acknowledging errors).
Errors are logged in the diagnostic memory of the Motion Terminal.
The valve state changes to a value of 3 (failure) when an error is present
(è 2.4.2.2 Structure of the input data (PDI)). When the error has been eliminated, the value changes to "0"
(not ready). Once the error has been acknowledged, the valve state changes back to a value of "1" (configurable).
Warning
A malfunction classified as a warning represents an undesirable state which, although it does not prevent the
function of the Motion app that is running, may restrict the performance of the Motion app.
Warnings are therefore displayed ("app state" section, è 2.4.2.1 Structure of the output data (PDO)) and logged in
the diagnostic memory of the Motion Terminal. However, warnings do not have a direct impact on the operation of
the Motion app.
2.7.3.2 Structure of the malfunction message
The information in the diagnostic memory of the Motion Terminal is made up of three parts:
– Malfunction code
– Malfunction subcode
– Classification of malfunction
The value transferred when the diagnostic memory is read is presented in bytes 5 ... 4 (PDI) in transfer mode and is
made up of the following:
PDI byte 5
Bit 7 Bit 6 Bit 5 Bit 4
Classifica­ Malfunction subcode
tion
Malfunction code and subcode
The malfunction code is used by the customer to locate the cause of the malfunction.
The malfunction subcode is primarily used by Festo to evaluate a malfunction, and should be passed on to
Festo Suppor t in the event of a malfunction.
A list of malfunction codes and subcodes with a description of the possible cause and appropriate remedial
measures can be found in the appendix to this document (è D Diagnostics using transfer mode).
48
Bit 3 Bit 2 Bit 1 Bit 0
PDI byte 4
Bit 7 Bit 6 Bit 5 Bit 4
Malfunction code
Festo – VTEM-Func+Par-EN – 2018-05a – English
Bit 3 Bit 2 Bit 1 Bit 0