Siemens Plc Rack

[Katina Piccirilli]

Iam using S7 414 - 4H redundant station. Both the CPU (Rack 0 and Rack 1) are going to run mode once we switch on the system and the entire plant is working fine. Even if the master is switched to Rack 1 also the system working fine.

My problem is when the rack 0 CPU is going to stop mode or any fault/power fail in rack 0 then the rack 1 switching as master but no communication is happening to the rack 1 from my programming device or from my SCADA system. But still the rack 1 CPU in RUN mode.

1. To check the Rack 1 CPU is really working fine or showing falsely as RUN, when both the CPU is in RUN mode i removed profibus cable from Rack 0 CPU but still the system is communicating to the Slave devices and getting the field values. This confirming that Rack 1 CPU is working fine and communicating to the field devices and synchronizing with Rack 0 PLC.

2. To check my Ethernet communication i performed Switching off of the Rack 0 CPU completely and loaded the PLC program in Rack 1, it was downloading to the CPU. So confirmed my ethernet cable and CP module of the CPU working fine. But couldn't able to go to online. If i tried to go online, it shows no online connection available.

3. When i switching the mode switch in Rack 0 CPU to stop mode, and when checking from my programming device about the operating modes, It showing that H Station - Solo mode, Rack 0 CPU STOP mode, and Rack 1 CPU - RUN mode. But when i tried to monitor any of the Function calls and when going to online, it shows the System in STOP mode (At bottom right of the window).

3. To check whether Rack 1 CPU is communicating to my programming device, i switched off Rack 0 PLC and tried pinging Rack 1 CP, its working, going online for diagnosing HardWare page, there it is going online, this confirms ethernet connectivity between PG/PD to Rack 1 CPU.

And in SCADA it was my stupid mistake, the winCC OA has setting for redundant device, we need to assign IP address of Rack 0 and Rack 1 CPU in that. I have did typo mistake in place of Rack 1 IP address.

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This Bracket is for the Flowrite Electronic Rack and Pinion Valve Actuator. This Rack and Pinion Bracket is used with OpenAir Electronic Actuator on Flowrite 1/2 to 2-inch, 2-way and 3-way valves with a 3/4-inch stroke. (Refer to part numbers 599-03609 and 599-03611 for Rack and Pinion Actuator assemblies.)

Also, will it be possible to import the tags from a flat file? The absolute addresses will be changing, and manually creating tags is not an option. I am already doing it with Kepware, and it would be no problem to change it as needed.

Actually one can export the tags from Kepware into csv.

Next step is to manipulate the csv to the right columns etc then import to ignition, have done this loads of times and importing 10000+ tags takes very little time.

I have also successfully exported tags from protools projects and WinCC and WinCC-Flexible projects this way into ignition.

Generally siemens structure tags vs ignition / kepware tags are

DB00.DBX0.0 ->DB00,X0.0

DB00.DBB0 -> DB00,B0

DB00.DBW ->DB00,I0

Using search and replace one can achieve the above very quickly.

Right now I export the S7 project to a text file and create the Kepware csv import file with a script in Ignition. I need to do the same thing if I am going to use the built in Siemens driver. How should I approach this? Create a csv file and import the tags through the designer? Or create a query and write the tags directly to the database? I would prefer the latter because then I could fully automate the process and update the tags from a client without opening the designer at all. But, maybe there is something else in your architecture that prevents this?

Ignition does the same with folders however it creates the structure slighly different.

The approach of importing them from siemens text file to ignition csv import is doable.

just create a tag with your folder structure in ignition then see how it does it in the csv.

From memory:

there is one line that defines the folder. the following lines define the tags within that folder.

The easiest approach is to generate the csv file and then import the csv file in the designer.

If you are using the external tags database provider instead of the internal tag provider then one could write a script to import them into the database diretly.

A central controller with up to seven I/O modules can be configured with the CR 700 2 subrack. A power supply and CPU module are always required.

Hardware interrupt evaluation is possible on the admissible slots for the corresponding modules.

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The front loading, field replaceable module design enhances the maintainability and upgradability of the switch as it allows modules to be changed without removing the chassis from the rack. This unique design also provides future proofing of the product as it can be deployed with Gigabit uplink SFPs and 100 Mbps LAN ports initially and then upgraded to 10 gigabit uplinks and Gigabit LAN ports as data communication needs increase.

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Aerotech has launched the XR3 six-axis drive rack with field-replaceable, front-mounted, 3U plug-in amplifiers to support both linear and PWM topologies. The XR3 can control any combination of brushless, DC brush or stepper motors at up to 320VDC operating voltage and 30A peak current capability.

Both the current loop and servo-loop are digitally closed to help ensure positioning accuracy and rate stability. This processing capability allows the XR3 to provide loop closure rates up to 20kHz and to handle both digital and analog I/O processing, data collection, process control and encoder multiplication tasks in real time.

E+E Elektronik has unveiled its EE660 sensor, which measures low air velocity. Designed for laminar flow monitoring and clean room applications, the transmitter is now also available with an RS-485 interface.

The EE660 is suitable for measuring low air velocity down to 0.15m/s. The sensing element features an E+E hot film sensing element. Furthermore, it is resistant to contamination and has a low angular dependency.

Remcom has announced its WaveFarer Automotive Radar Simulation Software, which lets OEMs and Tier 1 suppliers set up virtual scenarios and refine sensor performance earlier in the automotive design process.

WaveFarer uses ray-tracing algorithms adapted for radar applications to predict the scattered returns from a scene, with support for frequencies up to and beyond 79GHz. Near-field propagation and scattering methods compute raw radar returns from target objects while considering multipath interactions from ground reflections and other structures.

Siemens has released its Simotics HV C air-cooled range, which includes high-voltage motors up to 3.2 megawatts. The cooling concept, involving a combination of fin and tube cooling, provides temperature distribution in the motor.

The motors feature an enclosed internal circulation (IC 411) and are suitable for use in areas where there is no danger of explosions. They can be connected to the Sidrive IQ digital platform using the Simotics Connect 600 connector box, providing access to cloud-based analysis of the condition data that allows the drive system to be optimized.

From adjustable-depth 4-post racks for mounting extended-depth equipment in the data center to 2-post rack systems with integrated high-capacity vertical cable management for routing and protecting cabling and patch cords, Siemon offers a variety of rack solutions for all your network needs.

One of its best advantages is that its modules have a block design for swing mounting in a rack. Expansion racks are available to extend the system also.So, today we are going to discuss the various types of Racks in a PLC that could be implemented with these devices and we will clarify the differences between all of them.

The rack serves as the backbone of the modular PLC system that holds all the modules together such as the CPU, Power Module, Communication Module, Input-Output Modules, etc.In addition, PLC Rack synchronizes both the power and communication signal to all the modules.

A PLC Rack can be of different sizes and shapes depending upon the requirement of the control system.Smaller PLC systems often contain all of the components into one compact housing (often referred to as a shoebox or brick).

The backplane bus of the rack consists of two different bus systems:Input / Output (I/O) bus: this is a parallel backplane bus designed for the fast interchange of I/O signals. Each rack has an I/O bus. Time-critical operations to access the process data of the signal modules take place via the I/O bus.Communication (C) bus: this is a serial backplane bus designed for the fast exchange of large volumes of data parallel to the I/O signals. Except for racks ER1 and ER2, each rack has a communication bus.Types of S7-400 PLC RacksAn S7-400 programmable controller consists of a Universal rack (UR), a Central Rack (CR), and one or more Expansion Racks (ERs), as required.

Installation ManualS7-400, M7-400 Programmable ControllersModule SpecificationsIf you liked this article, then please subscribe to our YouTube Channel for Instrumentation, Electrical, PLC, and SCADA video tutorials.You can also follow us on Facebook and Twitter to receive daily updates.

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