rotork CK Series User Manual

Profibus Installation Manual
26
Hard-Wired Open and Close
These commands operate the actuator in the same way
as the open and close commands sent over the Profibus
highway.
Hard-Wired Stop
The hard-wired stop input acts as a change of state input.
If the actuator is moving, opening the Stop input will
stop the actuator. If the Stop input is already open and
a Profibus command is sent to the actuator, the Profibus
command will be initiated. To stop the actuator the hard-
wired input must be closed and opened again.
Hard-Wired ESD (Network Disable)
The hard-wired ESD may be set to cause the actuator to
drive to its Emergency position.
Alternatively, the input can be used to disable Profibus
network control. The function of the input is determined
by the parameterisation set into the PFU.
5.1.1 Controls Priority
Since there are three potential sources for control inputs
the actuator and Profibus DP Module assign a priority for
those occasions when two or more commands are applied
simultaneously.
For the Rotork actuator, the remote control hard wired inputs
can be used as discrete input signals, to report the status of
other devices or as control inputs. The associated Auxiliary
Input Mask parameter must be set for the required function,
see section 7.1.10. In the case of the hard wired input for ESD
this can be configured either as an ESD/DI-4 signal or as a
‘Net Command Inhibit’ to prevent Profibus network control
signals from moving the actuator.
Centronik controls priority
The following statements are useful when considering control
priority relating to the network commands and the
hardwired inputs:
1. Profibus commands and commands using the hardwired
inputs, with the exception of ESD, will not operate the
actuator unless it is in the remote mode.
2. All Profibus commands have the same priority, multiple
Profibus commands sent at the same time will cause
control contention, at which point it will continue
to perform the last good command. New Profibus
commands clear previous commands.
3. An ESD command sent over the Profibus network or using
the hardwired inputs (when enabled with the Auxiliary
mask) will have priority over all other commands (bear in
mind point 2). The ESD will operate the actuator in local
and remote.
4. Any ESD (network or hardwired) can also be set to
override local stop (refer to the installation manual).
5. A standing hardwired command (when enabled using
the auxiliary mask) will override any Profibus network
command, except
network ESD.
6. A maintained hardwired command (when enabled using
the auxiliary mask) can be overridden by a Profibus
network command.
7. An ESD over the Profibus network is maintained until a
new command is received, this includes a new Profibus
network command received in local i.e. a Profibus
network STOP will remove a DeviceNet network ESD
whilst in local.
8. An ESD over the hardwired is ONLY Push-to-Run, i.e. it is
not maintained.
The Actuator Cyclic Data Signals
A4US
US
A4
US A4
US
A4

rotork CK Series Specifications

General

Brand	rotork
Model	CK Series
Category	Controller
Language	English