Siemens S7-200 User Manual

[Teena Ruiter]

Themodules in the 400 Series have various combinations of relays, digital inputs, analog inputs, 1-Wire Bus (for temperature/humidity monitoring), etc. Most of the modules have fixed number of I/O; however, the X-400 has a ribbon-cable expansion bus which allows expansion I/O modules to be directly connected to the X-400, making its I/O customizable. The X-404 has an RS-485 bus that can be used to communicate with third-party modbus sensors and devices.

The 400 Series modules are setup and operated using a web browser without the need for custom configuration software. The 400 Series was built from the ground up for modern network connectivity and supports various protocols such as HTTP, HTTPS, Modbus/TCP, SNMP, and more.

Each X-4xx module has a basic selection of built-in I/O such as relays, digital inputs, analog inputs, or a 1-Wire Bus for monitoring temperature or humidity. The X-400 module has a ribbon cable expansion bus for connecting I/O expansion modules and the X-404 has an RS485 bus for connecting third-party modbus sensors and devices.

The X-412, X-418, and X-420 modules include a 16-bit, analog data acquisition system for use with industrial sensors, wind direction sensors, pyranometers, pressure transducers, and much more. The X-412 and X-420 have 4 analog inputs and the X-418 has 8. Each analog input channel is configurable for single-ended or differential operation (differential inputs require two channels).

Programmable voltage ranges include; 1.28V, 2.56V, 5.12V and 10.24V. Four of the channels can be configured for 4-20mA operation (first four channels of the X-418 and all four channels of the X-420). The 4-20mA mode enables a precision internal shunt resistor and configures the A/D for 5V operation. This feature allows direct connection to 0-20mA current loop transducers. Note that the four channels in the X-418 that do not support this feature can be used with 4-20mA sensors by adding a 250 Ohm resistor in parallel with the input.

The X-417 has up to five independent and scalable analog output channels. Each of these channels can be programmed to output a voltage or current. The analog outputs are similar to that of a Programmable Logic Controller (PLC). However, unlike a PLC, the X-417 is designed for web-based applications from the ground up. No add-on software or hardware is required.

Several modules have internal relays. The relays vary in size and configuration. Some modules share common terminal connections between relays with the contacts internally connected together and some modules have contacts that are completely isolated. The internal relays can be used to operate indicator lights, interposer relays, and other low-voltage devices. The screw terminals are internally connected directly to the relays with no internal fuse or other over-current protection. The relay contacts are isolated from all other circuits. Control the relays with a web browser, timers, input changes, or programmable logic.

Many of the modules have a 1-Wire port for connecting digital sensors for measuring temperature, humidity and more. The sensors are available in several configurations, are interchangeable and require no calibration. The sensors require three connections for communications and power (+5V, Gnd, Data). Control relays or trigger email messages based upon these values. Up to sixteen digital sensors can be connected to each 1-wire bus.

The X-420 has two digital I/O terminals. These I/O terminals are non-isolated, 5-volt logic and can be programmed as outputs or inputs. They have programmable pull-up or pull-down resistors when configured as inputs. They can be used as pulse counters with a maximum pulse rate of 200 Hz.

Users can monitor and control the devices using a web browser, the CBW Mobile app, or custom applications written for a computer, PLC, or other automation controller. With the built-in web server users can access the devices directly as a self-contained, stand-alone unit. No gateways, cloud servers, or external services are required. If desired, however, these devices can be used with our ControlByWeb.cloud cloud service to simplify network setup. The supports standard HTTP requests or encrypted HTTPS requests. The example below shows a web page which has a status display and on/off buttons for several relays. The relays can be renamed to show their operational function.

Some modules in this series include a built-in cellular modem which provides connectivity through cellular data networks in addition to Ethernet connectivity. The cellular network option can be used for primary communications for applications where no other network is available or it can be used as a backup when the local network fails. Note that cellular connectivity does not provide direct access to the built-in web pages. Instead, the cellular network can be used for outgoing alert messages and/or for connectivity through the cloud service. Note also that use of cellular network requires monthly service fees. Cellular connectivity is not shared with ethernet devices connected to cellular enabled devices.

The Real Time Clock is used for scheduled tasks and for logging. It can be set manually or automatically using NTP servers. When it is configured to be set using NTP, it can be configured to update the time one time or periodically so it will always be accurate. It can be configured to automatically adjust for daylight savings time.

Configurable logging of local and remote I/O, Vin, and Register values. It can be configured to log periodically, when events occur, or both. In addition to data logging, the 400 Series provides system logging of device operating parameters and events, such as power reset and NTP requests.

The 400 Series supports TLS V1.2 encryption. Specifically the supports HTTPS connections, can send encrypted emails, can communicate with remote devices using TLS, and send logged data to FTP servers over an encrypted connection.

400 Series devices can be configured to automatically connect to our cloud service called ControlByWeb.cloud. This feature is not required, but does simplify the configuration process and internet access to an X-4xx installed behind a network router by eliminating manual configuration of the device and port forwarding setup on routers. The option to use the X-4xx as a stand-alone device or through a cloud server makes it very powerful and very flexible. Note that by default this feature is disabled and the module(s) will not make any attempt to connect to the ControlByWeb.cloud service unless an account is set up and this feature is enabled by an administrator.

The 400 Series is designed from the ground up for reliability rather than cost savings. Shortcuts are not used in hardware design, programming, or assembly. It is built with industrial-grade, wide temperature range components which are more reliable than the components used in consumer-grade products. The devices include transient protection on the power input and all I/O circuitry, and operational protection such as watchdog timers and voltage supervisors. Every unit is fully tested before it is shipped from our facility.

The employs a switch-mode power supply which works from 9 to 28VDC. With this type of power supply, the current draw decreases as the voltage increases. The power supply voltage (Vin+) is monitored internally and can displayed, logged, or used for any standard logic function such as controlling a relay or configured to send email/text notifications. Some of the X-4xx modules can be powered using power over ethernet (POE) using 802.3af POE (48V) switches.

The 400 Series is designed to meet a broad range of commercial and industrial applications. These modules work well as stand-alone devices or as part of a larger system. Many of their features such as scheduling, logging, input state monitoring, and the ability to share I/O between devices, make them very powerful, yet simple controllers.

You can use the to control motors, lights, coils, pumps, valves, bells, etc. You can also use it to monitor alarms sensors, switches, fluid level switches, battery voltage, temperature, humidity, and much more. A few example applications include:

The simplicity of the device makes it an inherently secure device. Nevertheless, as with any device installed on a network, appropriate security precautions should be observed. Where security is concerned, access to the should be limited to using encrypted connections to the web server server using HTTPS. Unencrypted access can be disabled in the Network setup page.

It is recommended that passwords be enabled for the Administrators, Managers, and perhaps Users. Passwords should be at least 8 characters in length and use a combination of upper and lower case letters and numbers. For additional security, the device includes an IP filter and can be used in conjunction with an external firewall to further limit access to selected IP addresses.

ControlByWeb 400 Series devices all follow the same model number conventions. To see a full list of all available ControlByWeb 400 Series devices, visit ControlByWeb.com/products. The following will help you know which capabilities a device has:

The following list of expansion modules can be connected to the X-400 and X-400C ONLY. Other devices in the do not support these expansion modules. See ControlByWeb.com/expandable-io/ for an up-to-date list of available expansion modules.

The following list of optional accessories can be connected to compatible 400 Series devices. See ControlByWeb.com/sensors/ or ControlByWeb.com/accessories/miscellaneous/ for an up-to-date list of available accessories and sensors.

The 25-pin ribbon cable expansion bus connector allows for a family of expansion modules to be connected directly to the X-400. The ribbon cable provides both communication and power connections to the expansion modules. The cable can be a daisy chain with multiple connectors.

The Ethernet connector is a standard, 8-position modular receptacle for RJ-45 connectors. The Ethernet port supports auto-negotiation and automatically selects the speed, duplex mode and works with straight or crossover cables.

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