Overview
The possibility of integrating safety technology into standard automation not only offers the potential to save costs on plant construction, it also offers more flexibility in plant operation. Customers have confirmed to us that this is a particularly important aspect for them. Flexibility is achieved by transferring hardware functions to the software and using busses to transmit safety-oriented data. PROFIBUS has long since offered this feature with PROFIsafe, and PROFINET is now following suit. PROFIsafe is used as the profile. Networking possibilities including wireless are expanded with the Ethernet backbone. More uniformity. More flexibility. Typical of Totally Integrated Automation.
Safety functions
PROFINET Safety over Ethernet uses the approved PROFIsafe communication Profile. With the built in CRC checks and safe monitoring times, communications can be safely achieved over cables, Fibre optics and now wirelessly with 8011 compliant hardware such as the Scalance range of industrial Ethernet Switches and wireless access points and clients. PROFIsafe on PROFINET is approved to the same high standards as on PROFIBUS i.e. EN954-1 Category 4 (Equivalent to AS4024) and IEC 61508 SIL3.
New Hardware now available for PROFINET Safety:
With the new PROFINET Technology comes a range of new CPUs, Interface Modules and I/Os.
CPU 315F-2PN/DP, CPU 317F-2PN/DP, CPU 319F-3PN/DP
The new CPUs have both Profibus DP and Profinet interfaces. You can connect directly into an existing PROFIBUS DP network and have a PROFINET network simultaneously. Safety can be incorporated on both networks from the one CPU.
ET 200S
A new High Feature Interface Module (IM 151-HF PROFINET) is required to connect with PROFINET.
In conjunction with the IM is an updated Safe input module and Safe output module, both of which are backwards compatible with earlier versions and suitable for use with PROFIBUS Interface Modules also. In fact these new modules can be inserted in an existing PROFIBUS installation without the need to modify the hardware configuration. New power modules have also been released for PROFINET.
These new versions also incorporate single channel Passivation.
ET200M
Existing ET200M I/O can be used when directly connected to the PROFINET CPU but no ET200M style Interface Module is available at this point for remote connection on Profinet. Don't forget that for category 4 applications a Safety Protector module is required to isolate the Safe I/O modules.
ET200PRO
For IP65/67 applications ET200pro is available for Profinet with safety. This allows for direct connection of field devices without the need for control cabinets, thus reducing number of interconnections and allowing for smallest possible footprint whilst being water resistant.
Distributed Safety Software V5.4
With Distributed Safety version 5.4 the new modules and features are all available. An upgrade of Step 7 to version 5.3 SP3 is required.
Application
User benefits of PROFINET Safety
The wide range of network topologies with Ethernet as well as the ability to offer the complete automation solution on a single bus platform gives customers a clear advantage over traditional systems. Incorporating Safety into PROFINET completes the picture.