Festo VTEM - Diagnostics Channel in Transfer Mode

Festo — VTEM — 2021-05f
Function
85
Example
If another digital input module with 8 input channels (0 … 7) is installed between the bus node and the
Motion Terminal controller, the Motion Terminal controller uses channels E8 und A0.
3.8.3 Diagnostics channel in transfer mode
The Motion Terminal uses the transfer mode to supply diagnostic information which, independently
from the CPX error number, enables more precise analysis of the cause of the malfunction.
3.8.3.1 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 automati-
cally 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
3.8.3.6 Acknowledging
errors and clearing the malfunction list).
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
3.5.2.2 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
prevent 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
3.5.2.1 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.
3.8.3.2 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 PDI byte 4
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-
tion
Malfunction subcode Malfunction code
Tab. 112: Structure of the malfunction message