Structure Of The Malfunction Message - Festo VTEM Description, Function, Parameterisation

Function
Error
A malfunction classified as an error is so serious that the Motion App currently running is automatic-
ally 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 2.8.3.6 Acknowledging errors).
Errors are logged in the diagnostic memory of the Motion Terminal.
The status of the valve (valve state) changes to a value of "3" (failure)
(è 2.5.2.2 Structure of the input data (PDI)) when an error is present.
When the error has been eliminated, the value changes to "0" (not ready). Once the error has been
acknowledged, the valve status changes back to a value of "1" (configurable).
Warning
A malfunction classified as a warning represents an undesirable state which, although it does not pre-
vent the basic function of the Motion App that is running, may restrict the performance of the Motion
App. Warnings are therefore displayed (section "app state",
è 2.5.2.1 Structure of the output data (PDO)) and logged in the diagnostic memory of the Motion Ter-
minal. However, warnings do not have a direct impact on the operation of the Motion App.
2.8.3.2

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 Bit 3 Bit 2 Bit 1 Bit 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Classifica- Malfunction subcode
tion
Tab. 101 Structure of the malfunction message
Malfunction code and subcode
The malfunction code is sufficient for the user to locate the cause of the malfunction. The malfunction
subcode permits a detailed evaluation of the malfunction when required and should therefore always
be specified when contacting Festo Support.
A list of malfunction codes with a description of the possible cause and appropriate remedial meas-
ures can be found in the application note "Malfunction Code VTEM" (è 1.1 Applicable documents).
Malfunction subcodes that can be used by the user to remedy errors are given here also.
82
PDI byte 4
Malfunction code
Festo — VTEM — 2019-03b