EPS Stromversorgung PS 5040-10 A, Operating Manual, Page: 31 / 36

Page 31
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PS 5000 A Series
3.5 Remote control
3.5.1 General
Remote control is principally possible via the built-in USB interface. Important here is that the device never auto-
matically changes into remote control mode, for example by receiving the first command. It has to be switched to
remote control by the user and by using an explicit command. This can be denied by the device in case remote
control is not allowed due to “ Local ” mode being active. See further description below.
However, status monitoring and reading of values are always possible.
3.5.2 Control locations
Control locations are those locations from where the device can be controlled. Essentially there are two: at the
device (manual operation) and outside (remote control). The following locations are defined:
Displayed location Description
- If neither of the other locations is displayed then manual control is active and access from
the digital interface is allowed. This control location is not explicitly displayed
Remote Remote control via digital interface is active
Local
Remote control is locked, only manual operation is allowed.
Remote control may be allowed or inhibited using button Local . In
inhibited condition the status “
Local
” will be displayed (lower row)
of the display. See example screenshot to the right.
Activating the inhibit 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, which would not
be possible remotely.
Activating condition “
Local ” causes the following:
• If remote control via the digital interface is active (“ Remote ”), then remote control is immediately terminated and
must be reactivated at the PC once “ Local ” is no longer active
•
If manual operation is used, remote control from a PC can’t be activated
3.5.3 Remote control via the digital interface
3.5.3.1 General
The USB interface requires no additional setup for operation. Via the digital interface primarily the set values (volt-
age, current, power) and device conditions can be set and monitored. Furthermore, various other functions are
supported (protections, recall feature) 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.
3.5.3.2 Programming
The devices supports ModBUs RTU protocol. Programming details for the USB interface and the Modbus protocol
are to be found in the documentation “Programming Guide ModBus & SCPI“ which is supplied on the included
USB stick or which is available as download from the manufacturer’s website.