User Manual

Page 49
EA Elektro-Automatik GmbH
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PSI 9000 3U Series
3.3.7 Switching the DC output on or off
The DC output of the device can be manually or remotely switched on and off. This can be restricted in manual
operation by the control panel being locked.
► How to manually switch the DC output on or off
1. As long as the control panel is not fully locked press the button ON/OFF. Otherwise you are asked to dis-
abletheHMIlockrst.
2. This button toggles between on and off, so long as a change is not restricted by an alarm or the device is
locked in “remote”. The current condition is displayed as “Output ON” or “Output OFF”.
► How to remotely switch the DC output on or off via the analog interface
1. See section “„3.4.4 Remote control via the analog interface (AI)“ on page 51.
► How to remotely switch the DC output on or off via the digital interface
1. See the external documentation “Programming Guide ModBus & SCPI” if you are using custom software,
or refer to the external documentation from LabView VIs or other software provided by the manufacturer.
3.4 Remote control
3.4.1 General
Remote control is principally possible via the built-in analog or USB port or via one of the optional interface mod-
ules (AnyBus CompactCom). Important here is that only the analog or one digital interface 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 at 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.
3.4.2 Control locations
Control locations are those locations from where the device is controlled. Essentially there are two: at the device
(manualoperation)andoutside(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 may be allowed or inhibited using the setting “Allow remote control” (see „3.3.3.1. Menu “General
Settings”“). In inhibited condition the status “Local” will be displayed top 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 remote control is via the analog interface is active (“Remote”) then remote operation is only interrupted until
remote control is allowed again, because pin “Remote” continues to signal “remote control = on”. Exception: if
the level of pin “Remote” is changed to HIGH during the “Local” phase.