User manual

Page 37
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
EL 3000 B Series
3.5 Remote control
3.5.1 General
Remotecontrolispossibleviaanyoftheoptionallyavailable,user-retrottableinterfacecards(referto„1.9.4.
Optional accessories“) and their feature analog or digital interface port. Important here is that only one of both
ports can be in control. It means that if, for example, an attempt were to be made to switch to remote control via
the digital interface whilst analog remote control is active (pin Remote = LOW) the device would report an error
via the digital interface. In the opposite direction, a switch-over via Pin Remote would be ignored. In both cases,
however, status monitoring and reading of values are always possible.
3.5.2 Controls locations
Control locations are those locations from where the device is control. Essentially there are two: at the device
(manualcontrol)andexternal(remotecontrol).Thefollowinglocationsaredened:
Displayed location Description
- If neither of the other locations is displayed then manual control is active and access from
the analog and digital interfaces is allowed. This location is not explicitly displayed
Remote Remote control via any interface is active
Local Remote control is locked, only manual operation is allowed.
Remote control can be explicitly allowed or inhibited using the setting “Allow remote control” (see “„3.4.3.2.
Menu “General Settings”“). In inhibited condition, the status “Local” will be shown in the status area of the display.
Activating the lock can be useful if the device is remotely controlled by software or some electronic device, but it is
required to make adjustments at the device or deal with emergency situations, which would not be possible remotely.
Activating condition “Local” causes the following:
• If remote control via the digital interface is active (shown as “Remote”), then it is immediately terminated and
in order to continue remote control once “Local” is no longer active, it has to be reactivated from the PC side
• If remote control via the analog interface is active (“Remote”), then it is temporarily interrupted until remote control
is allowed again by deactivating “Local”, because pin “Remote” continues to signal “remote control = on”, unless
the signal has been changed during the “Local” period.
3.5.3 Remote control via a digital interface
3.5.3.1 Selecting an interface
The device only supports the optionally available, digital interfaces USB and Ethernet.
For USB, a standard USB cable is included in the delivery of the interface card, not with the device, as well as a
driver for Windows on USB stick. The USB interface requires no setup in the MENU.
The Ethernet interface typically requires network setup (manual or DHCP), but can also be used with its default
parameters right from the start.
3.5.3.2 General
For the network port installation refer to „1.9.7. Ethernet port (optional)“.
Thedigitalinterfacerequirelittleornosetupforoperationandcanbedirectlyusedwiththeirdefaultcongura-
tion.Allspecicsettingswillbepermanentlystored,butcouldalsoberesettodefaultswiththesetupmenuitem
“Reset Device”.
Via the digital interface primarily the set values (voltage, current, power) and device conditions can be set and moni-
tored. Furthermore, various other functions are supported as described in separate programming documentation.
Changing to remote control will retain the last set values for the device until these are changed. Thus a simple
voltage control by setting a target value is possible without changing any other values.
3.5.3.3 Programming
Programming details for the interfaces, the communication protocols etc. are to be found in the documentation
“Programming Guide ModBus RTU & SCPI“ which is supplied on the included USB stick or which is available as
download from the EA Elektro-Automatik website.