Installing and Starting the Ethernet CP with STEP 7

Table 2-1 Settings in the “Options” Tab , continued

Option

Meaning / Effect

 

 

S Multiplex OP Connections /

To attach TD/OPs or HMI devices, you can optimize the connection

Reserve Internal CPU

resources on the S7-300 CPU by having up to 16 of these devices

Connection Resources

communication on a single CPU connection resource (multiplex

 

mode).

 

If you do not use this option, the number of operable TD/OPs or HMI

 

devices depends on the number of available connection resources of

 

the CPU you are using.

 

As default, this option is deactivated. This means that a CPU

 

connection resource is used for multiplex only when necessary.

 

Configured S7 connections over the CP use the same multiplex

 

channel as you use for multiplexing the HMI connections. If you

 

configure S7 connections, this means that one CPU connection

 

resource is already used.

 

Please note: PG connections do not use the multiplexer; if you use a

 

PG, one connection resource is always occupied.

 

Note on Programming:

 

When you use the multiplex mode, you must specify the rack/slot

 

assignment of the CP for addressing on TD/OP/HMI connections

 

instead of the rack/slot assignment of the CPU!

 

Applications (for example ProAgent) that require block-related

 

messages (Alarm_S: SFC17-19) are not supported in the multiplex

 

mode.

 

 

Time-of-Day Synchronization Tab

In this tab, you can make the settings for one of the two synchronization modes explained below:

SSIMATIC mode

If the CP receives MMS time-of-day frames, its local time is synchronized providing the NTP mode was not configured (MMS = Manufacturing Message Specification).

The advantage of this mode is the accuracy that is generally higher than achieved with the NTP mode.

SNTP mode (NTP: Network Time Protocol)

In the NTP mode, the CP sends time queries (in the client mode) at regular intervals to the NTP server in the subnet (LAN). Based on the replies from the server, the most reliable and most accurate time is calculated and the time of day on the station is synchronized.

The advantage of this mode is that the time of day can be synchronized beyond the boundaries of the subnet.

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Siemens S7 appendix Time-of-Day Synchronization Tab

S7 specifications

The Siemens S7 series represents a cornerstone in the realm of programmable logic controllers (PLCs), developed by Siemens, a leading company in industrial automation. Widely used across various industries, the S7 series offers robust solutions for controlling machinery and processes, thanks to its reliable performance, flexibility, and scalable architecture.

One of the key features of Siemens S7 PLCs is the modularity of their design. Each system can be configured to meet specific application requirements due to the ability to mix various input/output modules, CPUs, and communication processors. This modular approach allows for the customization of systems to suit diverse automation tasks, providing end users with the adaptability required for modern manufacturing environments.

The S7 series encompasses several models, including the S7-1200, S7-300, and S7-1500. The S7-1200 is particularly suited for small to medium-sized applications, offering a compact design and integrated communication interfaces. In contrast, the S7-300 is designed for more extensive and complex control systems, making it ideal for large-scale industrial applications. The S7-1500 stands out with its advanced performance metrics, rich feature set, and high-speed processing capabilities, making it perfect for demanding applications that require real-time control and extensive data handling.

Siemens also emphasizes the importance of communication technologies within the S7 series. With options such as PROFINET, PROFIBUS, and EtherNet/IP, the S7 PLCs can seamlessly integrate into existing automation infrastructures, ensuring smooth data exchange between devices. The incorporation of web-based technologies and cloud connectivity further enables remote monitoring and control of systems, enhancing operational efficiency.

Another notable characteristic of Siemens S7 PLCs is the use of TIA Portal (Totally Integrated Automation Portal), an innovative software platform that simplifies the engineering process. TIA Portal allows users to program, configure, and diagnose their automation devices in a single environment, reducing setup times and improving productivity.

In conclusion, the Siemens S7 series stands out due to its modular design, range of models suitable for various applications, advanced communication technologies, and user-friendly programming software. This combination of features and characteristics makes S7 PLCs a preferred choice for industries seeking reliable and efficient automation solutions. As industrial demands continue to evolve, Siemens S7 PLCs remain at the forefront, adapting to technological advancements and setting benchmarks in the automation field.