Festo Электроцилиндр - Manual (Page 109)

B Control via Ethernet (CVE)
Festo – GDCP-CMMO-ST-EA-SY-EN – 1301a – English 109
B Control via Ethernet (CVE)
B.1 Basic principles
The CMMO-ST can be controlled via the Ethernet interface of a PC program by using the function
“Control via Ethernet” (CVE). This enables status data to be written from CMMO-ST and control data to
be written to CMMO-ST.
To use the CVE function the CMMO-ST is pre-parameterised with FCT. CVE cannot be used to make any
changes to the parameterisation. CVE can be used to start records and a homing run. The intermediate
stop (pause) as well as jogging and teaching are not supported.
Communication with the CMMO-ST is achieved via the CVE protocol. This must be imple-
mented in the PC application. Knowledge of programming TCP/IP applications is required
for this purpose.
Caution
Not using the CVE interface as intended can result in personal injury and material
damage.
– The CVE interface is not real-time capable.
Controlling the CMMO-ST via Ethernet requires, among other things, a risk assessment
by the user, ambient conditions that are free of interference and reliability of data trans-
mission, e.g. via the control programme of the higher-order controller.
• Only use the CVE function in applications in which the lack of real-time capability
cannot pose risks.
• In order to ensure machine safety the STO function must be used.
B.1.1 Communication principle
The basis for the CVE protocol is TCP data transmission (Transmission Control Protocol). The controller
acts as the server in this setup, while the PC application acts as the client, i.e. the PC application always
sends a request to the controller, which sends back a response (client-server principle).
The TCP connection is typically established once and remains in effect for as long as communication is
required with the CMMO-ST. If the drive is in motion when the connection is ended, a Quick Stop func-
tion is triggered.
The TCP port used can be set via FCT. The default port number is 49700.