Festo EXCM-30 -PF Series, Руководство пользователя

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5 Operation
52 Festo – EXCM-30/-40-...-PF-EN – 1603 – English
5.5.3 CVE protocol
Access to the data of the controller is through CVE objects. A CVE object always has a unique index that
enables identification of the object.
Note
A series of CVE objects is listed in the appendix (
è
C.1 CVE object overview).
In the following, the notation xxx.y (object index.object subindex) is used for CVE ob­
jects.
Caution
Personal injury and material damage
Inadvertent writing to non-documented objects can result in unforeseeable behaviour of
the planar surface gantry.
Use only objects listed in the appendix (
è
C.1 CVE object overview).
Each CVE object has one of the following listed data types (
è
Tab. 5.12 Data types).
The byte sequence is Little Endian, that is, the lowest-value byte first.
Data types
Value Type Bytes Description Range of values
0x00 – – Unknown data type –
0x01 – – – –
0x02 UINT32 4 32 bit unsigned integer 0 … 4294967295
0x03 UINT16 2 16 bit unsigned integer 0 … 65535
0x04 UINT08 1 8 bit unsigned integer 0 … 255
0x05 – – – –
0x06 SINT32 4 32 bit signed integer – 2147483647 … 2147483647
0x07 SINT16 2 16 bit signed integer – 32767 … +32767
0x08 SINT08 1 8 bit signed integer – 127 … +127
Tab. 5.12 Data types
Read object
To read a CVE object, a request corresponding to Tab. 5.13 must be sent to the controller. This sends
back a response corresponding to Tab. 5.14.
Write object
To write a CVE object, a request corresponding to Tab. 5.15 must be sent to the controller. This sends
back a response Tab. 5.16.