SCALANCE W700 client modules make it possible for a node with an Industrial Ethernet interface (e.g. a controller) to move seamlessly and with no wear and tear in an Industrial Wireless LAN RF field. The node logs on in the RF field via the client module and can exchange information with the entire data network. If the client module moves, for example, on an automated guided vehicle system, it is automatically and transparently handed over from one access point to the next (roaming).

This is possible over distances of up to 30 m indoors (approx. 100 m outdoors). Additional directional antennas can be used outdoors to achieve ranges of several thousand meters.

Apart from a reliable wireless link, a major feature of the SCALANCE W700 client modules is their support of IT mechanisms:

• IEEE 802.11a/b/g/n for different frequency ranges
• IEEE802.11e for wireless multimedia (WMM)
• IEEE802.11i for security
• Sending the log entries of the SCALANCE W devices to a Syslog server
• Modern security mechanisms (e.g. network security such as IEEE 802.1x, RADIUS, EAP mechanisms)

Security

A high degree of data security is achieved by means of the WPA2/IEEE 802.11i mechanisms. These define modern procedures that control a regular exchange of the complete 128-bit key as well as performing the access check (authentication) of a node. The Advanced Encryption Standard (AES) is available for data encryption.

On top of this, access to the devices (HTTPS) is encrypted and a secure logon (SSH) is possible. If a security concept in combination with SCALANCE S is required, the security requirements can be increased using Virtual Private Networks (VPN).

Scope of functions

Depending on the product version, the SCALANCE W700 client modules can manage the wireless connection for up to eight connected devices with Ethernet interface. It is possible for mobile units with a small Ethernet network (up to eight devices) to be linked into an IWLAN RF field.

iFeatures (only in conjunction with KEY-PLUG or SCALANCE W722-1 RJ45))

iPCF (industrial Point Coordination Function):
The iPCF mode is a good choice for applications with requirements for real-time and predictable response times (deterministic response), even when mobile nodes are roaming from one access point to the next. This ensures that wireless PROFINET IO is supported and that safety-related signals, e.g. emergency stop, can be linked into the RF field.

The iPCF mechanism expands the IEEE 802.11 standard and must be available on both the client module and the access point. In an RF field in which iPCF is used, no IEEE 802.11-compliant nodes can be operated.

iPCF is recommended for applications where wireless network nodes move along predefined paths (e.g. suspended monorail). RCoax radiating cables or directional antennas must be used for this purpose.

Linking in an automated guided vehicle system using iPCF with the SCALANCE W722-1 RJ45

iPCF-MC (iPCF Management Channel) ^1):
iPCF-MC is available as a further development of iPCF. This mode should be used if IWLAN stations that also support iPCF-MC move freely about in the coverage area (especially when using omni-directional antennas) and are to exchange data deterministically. This functionality can only be achieved in connection with access points with two wireless interfaces and the KEY PLUG.

Note:
These iFeatures cannot be used in parallel.

Diagnostics and management

• Web-based (HTTP/HTTPS) management tool for configuration and diagnostics using a standard browser
• LEDs for signaling operating status and fault/error states
• Signaling of faults by means of SNMP trap or e-mail to a network management tool
• Configuration and diagnostics using Web based Management, Command Line Interface, and SNMP. Devices and networks can be configured using STEP 7 (TIA Portal). For cyclic monitoring, diagnostics and documentation (reporting) in network mode, the SINEMA Server software is recommended.

1) Available soon