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Siemens Logo Comfort V7.1 on Centos 6 x64 install

Today I tried to install Siemens Logo Comfort V7.1 on Centos 6.5. The installation is started using the start.sh command in /Linux on the DVD. This does not work as the path is not recognized by the star.sh file. When opening the start.sh file it appears the installation is started from /CDROM_Installers/Disk1/InstData/Linux/VM/Setup.bin However when this is executed I got the […]

Configure NTP

The right time on our servers is extremely important. We use the NTP (Network Time Protocol) to synchronize the clock of our servers to the internet and to each other. On this page we gathered our knowledge about setting up NTP. First the NTP package need to be downloaded and installed. We use RedHat/Centos/Fedora most of the time, the package […]

Limit log file size.

Our systems run 24/7. Monitoring our systems is done with log-files. In these log-files we gather all necessary information for debugging our software. The log-files contain information about connections, reading data, database or file accessibility¬† and other processes. Due to the extensive logging of our software there is a high risk of disk space shortage when systems are running for […]

Siemens Step-7 Namur NE43 analog input.

Siemens S7-300 does not come standard with Namur NE43 functionality on analog inputs. For one of our projects we created a block to evaluate sensor status according Namur NE43. In this configuration the SM331 analog input modules is used in 2-wire configuration. And the Namur NE43 capable temperature and pressure transmitters are connected to the analog inputs. Because the block […]

Count the ones in a doubleword Siemens Step 7

Counting the number of ones in a doubleword can be done in several ways. The most obvious is to shift the bits in the doubleword and count the number of ones while shifting. This method works fine for a byte, because only 8 bits need to be evaluated. However when a double word need to be processed 32 cycles are […]

PLC Watchdog unit WD601

BlueDelta developed the WD601 Watchdog unit to monitor the PLC execution cycle. Although modern PLC systems have an internal watchdog unit it can be necessary to monitor the PLC externally. The WD601 watchdog unit is developed for this purpose. It can easily be monitored and most important it can be demonstrated during factory acceptance tests. Which can be a real […]

DNS delay script

In one of our projects we had a problem with a host taking to long to respond. During our investigation the problem appeared to be in the DNS name resolving. The DNS server took to long to respond to the query. This happened not every time, but occasionally. To pinpoint the problem we made the following bash script to test […]