Festo VTEM - Page 88

88
Festo — VTEM — 2021-05f
Function
After acknowledging the error, the valve status changes to "configurable" (valve state = 1 (configu-
rable)) (
è
3.8.3.6 Acknowledging errors and clearing the malfunction list).
3.8.3.5 Readout of a malfunction list
A malfunction list is read out using the transfer mode (valve mode = 63). The sections of the process
data are used as follows:
–
Operating mode of the valve (valve mode): 63 (transfer mode active) (PDO byte 0, bits 5 … 0 =>
111111
2
)
– Channel (channel): 31 (malfunctions) (PDO byte 1, bits 4 … 0 => 11111
2
)
– Transfer control (transfer control): 2 (upload) (PDO byte 1, bits 7 … 5 => 010
2
)
–
Addressing of data transfer (addressed target): valve slot for which the malfunction list is to be read
out
è
Tab. 116 Selection of the malfunction list (PDO byte 2 => 0, 100 … 107).
– Index (index): position of the malfunction list with the value that is to be read out
è
Example of a
malfunction list (PDO byte 3 => 1 … 40, 253 … 255).
addressed target Meaning
0 Malfunction list of the valve slot via which the process data area is commu-
nicated
100 Malfunction list of valve slot 0
101 Malfunction list of valve slot 1
102 Malfunction list of valve slot 2
103 Malfunction list of valve slot 3
104 Malfunction list of valve slot 4
105 Malfunction list of valve slot 5
106 Malfunction list of valve slot 6
107 Malfunction list of valve slot 7
Tab. 116: Selection of the malfunction list
Example of output data for reading out the most recent entry in a malfunction list
Starting point for the sample content of a malfunction list
è
Tab. 115 Example of a malfunction list.
Example of output data for reading out the most recent entry in a malfunction list
PDO byte 1 PDO byte 0
Command
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
0 1 0 1 1 1 1 1 ... ... 1 1 1 1 1 1
transfer control
= 2
channel = 31 – valve mode = 63 (transfer mode)