Industrial PC
Application Note DK9122-0311-0026
Monitoring and diagnosis
Keywords
1-second UPS
UPS
Non-interruptible
Power supply
Power failure
Save data
C6915
CX5000
CP77xx
CP62xx
1-second UPS: Securing important data in case of power
failure
This application example describes the advantages of using UPS-assisted Industrial PCs on the basis of
three exemplary applications. As an ‘on-board UPS,’ the capacitor-assisted 1-second UPS from Beckhoff is
very compact, inexpensive and maintenance-free due to the low power consumption of the Intel® Atom™
based motherboard. If a UPS of several minutes duration is not needed, the capacitor performance is
sufficient in many applications to save important data before the IPC switches itself off.
Uninterruptible power supply (UPS)
In the event of a power failure, a UPS creates time for saving important data from the main memory to non-volatile memory.
Depending upon the version, a UPS bridges the power supply for a longer period. External rechargeable battery packs installed
close to the PC are often used.
On-Board-USV
Due to the low power consumption of the Intel® Atom™ based motherboard, Beckhoff offers an ‘on-board UPS’ that is very
compact, inexpensive and maintenance-free. Since the ‘1-second UPS’ is also fully integrated into TwinCAT, the customer
has the same advantages as with a regular UPS, but at a lower cost. The time that can be bridged varies according to the
motherboard: depending upon the board, it remains operational for several seconds following a power failure. The relevant
data must be saved during this time. It was possible to save a maximum of 128 KB data with the NOVRAM; at least 1 MB data
can now be saved with the capacitive 1-second UPS.
Areas of application of the 1-second UPS
For application notes see disclaimer on the last page
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Industrial PC
FB_S_UPS
sNetID
iPLCPort
iUPSPort
tTimeout
ePersistentMode
tRecoverTime
bPowerFailDetect
eState
eUpsMode
Application Note DK9122-0311-0026
Monitoring and diagnosis
The 1-second UPS from Beckhoff is available for the following Industrial PCs and embedded devices:
– Embedded PCs from the CX50x0 series
– Industrial PC C6915
®
– Control Panels from the CP62xx and CP77xx series with Intel
Atom™ motherboard
UPS under TwinCAT
The UPS is controlled in TwinCAT by the calling of a function block. Depending on the selected mode, the function block FB_S_
UPS initiates the storage of persistent data and/or QuickShutdown of the operating system in the event of a power failure. The
necessary library is integrated into the installation from TwinCAT 2.11 R2 Build 2016 onwards. For older TwinCAT versions, an
appropriate library must be copied into the library folder.
Fig. 1 TwinCAT function block for controlling the UPS
Behavior of the UPS: Data handling
For application notes see disclaimer on the last page
Beckhoff
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Application Note DK9122-0311-0026
eSUPS_WrPersistData_Shutdown
eSUPS_WrPersistData_NoShutdown
eSUPS_ImmediateShutdown
eSUPS_CheckPowerStatus
writing of persistent data and then a
QuickShutdown
only writing of the persistent data
(no QuickShutdown)
only QuickShutdown
(no writing of persistent data)
pure monitoring
(neither writing of persistent data nor a
QuickShutdown) Data handling is entirely at
the discretion of the user.
mode operation
Monitoring and diagnosis
Industrial PC
Fig. 2 The mode defines whether persistent data is to be written and whether a QuickShutdown is to be performed.
Practical examples
The advantages of UPS-assisted use for typical areas of application:
1. Switching off plants by the main switch
2. Logging lots, process values and measured values
3. Securing the process image
1. Switching off plants by the main switch
Mobile plant elements with their own control and separate power supply are frequently switched off via the integrated main
switch, without giving consideration to the state of the controller. The use of the 1-second UPS from Beckhoff guarantees that,
when the power supply is switched off, the plant can save the relevant operating data that need to be available when switched
on again.
For application notes see disclaimer on the last page
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Application Note DK9122-0311-0026
Restart of the plant
Saving of the data
Quickshutdown
power failure
Restart of the PC
Loading of the data
With 1-second UPSWithout UPS
PC failure
Restart of the work step
Resumption of the work step
Monitoring and diagnosis
Industrial PC
Fig. 3 Practical example: ‘switching off plants by the main switch’
2. Logging lots, process values and measured values
For the complete documentation of the manufacturing process of an individual component, the lot number, time and, if
necessary, tool changes are logged at each station.
For application notes see disclaimer on the last page
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Application Note DK9122-0311-0026
Restart of the plant
Saving of the data
PC failure
power failure
Restart of the PC
With 1-second UPSWithout UPS
Restart of the work step
Resumption of the work step
Removal of the components
Station C
Nr. xxxx
Station A
Nr. xxxx+2
Station B
Nr. xxxx+1
Station A
Nr. ???
Station B
Nr. ???
Station C
Nr. ???
Station A
Nr. xxxx+2
Station B
Nr. xxxx+1
Station C
Nr. xxxx
Insertion of new components
Quickshutdown
Monitoring and diagnosis
Industrial PC
Fig. 4 Practical example: ‘logging lots, process values and measured values’
The storage of these data in the event of a power failure avoids having to declare entire lots as scrap, after switching on again
and checking the components.
3. Securing the process image
The entire process image is saved for fault finding and reconstruction of the events leading to errors. As a result, the state of
individual components within the plant in the event of a power failure is comprehensible for the service personnel and can be
referred to for clarification.
For application notes see disclaimer on the last page
Beckhoff
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Application Note DK9122-0311-0026
Monitoring and diagnosis
– Embedded PC CX5000 www.beckhoff.com/CX5000
– Control cabinet Industrial PC with Intel® Atom™ www.beckhoff.com/C6915
– The compact Industrial PC with mounting arm www.beckhoff.com/CP77xx
– The slimline built-in Industrial PC with 3½-inch motherboard www.beckhoff.com/CP62xx
– Reference of USV software components
http://infosys.beckhoff.com/content/1033/tcplclibsups/html/tcplclibsups_overview.htm
Industrial PC
This publication contains statements about the suitability of our products for certain areas of application. These statements are based on typical features of our products. The examples shown in this publication are for demonstration purposes only. The information provided herein should not be regarded as specific operation characteristics. It is incumbent on the
customer to check and decide whether a product is suit-able for use in a particular application. We do not give any warranty that the source code which is made available with this
publication is complete or accurate. This publication may be changed at any time with-out prior notice. No liability is assumed for errors and/or omissions. Our products are described
in detail in our data sheets and documentations. Product-specific warnings and cautions must be observed. For the latest version of our data sheets and documentations please visit
our website (www.beckhoff.com).
© Beckhoff Automation GmbH, March 2011
The reproduction, distribution and utilisation of this document as well as the communication of its contents to others without express authorisation is prohibited. Offenders will be
held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or design.
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