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System Configuration Section 1-2
1-2 System Configuration
1-2-1 DeviceNet Safety System Overview
DeviceNet is an open-field, multi-vendor, multi-bit network, which combines
the controls in the machine and line control levels with information. The
DeviceNet Safety network adds safety functions to the conventional
DeviceNet standard communications protocol. The DeviceNet Safety concept
has been approved by a third-party organization (TÜV Rhineland).
Just as with DeviceNet, DeviceNet Safety-compliant devices from third-party
vendors can be connected to a DeviceNet Safety network. Also, DeviceNet-
compliant devices and DeviceNet Safety-compliant devices can be combined
and connected on the same network.
By combining DeviceNet Safety-compliant products, a user can construct a
safety control/network system that meets the requirements for Safety Integrity
Level (SIL) 3 according to IEC 61508 (Functional Safety of Electrical/Elec-
tronic/Programmable Electronic Safety-related Systems) and the require-
ments for Safety Category 4 according to EN 954-1.
Standard
communications
Safety Network Controller
-
Safety Master
-
Standard Slave
Standard PLC/Standard Master
Safety Terminal
-
Safety Slave
-
Standard Slave
Safety Network Controller
-
Safety Slave
-
Standard Slave
Standard Slave
Network Configurator
Safety
configuration
Standard
configuration
Safety
communications
Safety Control as a Safety Network
Controller
-
Safety I/O Communications
Standard Control and Monitoring as
a Standard PLC
-
Standard I/O communications
-
Explicit message communications
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