Festo CMMT-ST-SW, Оригинальное руководство пользователя

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Assuming and relinquishing the master control
Through the revocation of the master control by the plug-in, active setpoint settings are interrupted,
such as those made in the device profile.
The plug-in can assume and relinquish the master control at any time, even during an active motion
for example. If the plug-in assumes or relinquishes the master control, the device performs a Category
1 stop. Depending on the parameterisation, the master control then returns to the device profile inter-
face (factor setting) or I/O interface.
Recommendation: When relinquishing the master control, proceed as follows:
1. Make sure the drive is at a standstill in a regulated manner (e.g. by a stop command, stop cat-
egory 2).
2. Revoke the controller enable (stop category 1, drive is at a standstill in an unregulated manner).
3. Relinquish the master control.
No master control is required for parameterisation. Parameterisation through the standard Ethernet
and device profile interfaces is always possible.
Simultaneous connections via standard Ethernet interface
Through the standard Ethernet interface, 2 connections at once are technically possible, e.g. through
2 device-specific plug-ins. If the master control has been assumed by a device-specific plug-in, the
plug-in has the master control until it relinquishes the master control again.
If the plug-in relinquishes the master control, the device performs a Category 1 stop.
Time-out
If the device-specific plug-in has the master control, the device detects when the connection to the
plug-in has been interrupted. The device executes the parameterised reaction. The time-out time is
typically 5 s. For slow networks, a longer time-out time can be selected.
3.1.5 Device services
Device services are executed by the methods described in the following sections. Functions close to
the hardware, such as reset of the device, can be called.
The status query of a method delivers one of the following return values:
Method status:
–
0 = ready
– 1 = execute
– 2 = ended
– 3 = Error
The query of the return code of a method delivers one of the following return values:
–
0 = successful
– 1 = Error
Product configuration
106 Festo — CMMT-ST-SW — 2019-02