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Introducing a Safety Network System that
dramatically alters previous safety design. Programmable safety
circuits are incorporated to facilitate efficient designing and
modifications. Moreover, Safety I/O Terminals can be added to increase
safety I/O capacity for distributed allocation through the network.
DeviceNet wiring on the existing network can be used as is,
facilitating efficient design by expanding on the existing system.
The programmability of safety circuits,
expandability of I/O using the network, and compatibility with the
DeviceNet open network effects major changes to the framework of
previous safety design systems.
Complies with the Highest
Safety Standards in the World
The DeviceNet Safety
System conforms to IEC 61508 SIL3 for functional safety, and EN 954-1
Safety Category 4 for machine safety, complying with the world's
highest level of safety standards.
IEC 61508 SIL 3
Safety circuits must be able to function
to provide safety at anytime. Conversely, the degree of lack of safety
is used as the indicator. In IEC 61508, safety is defined as the
Probability of Failure per Hour, or PFH. Based on this, the SIL
(Safety Level) is classified into four levels. SIL 3 indicates a
probability of dangerous failure of once in 1,000 years, which is the
highest level in machine safety.
EN 954-1 Safety Category
4
EN standards evaluate the level of
machine risk and require the incorporation of risk minimization
measures. In EN 954-1, five safety categories have been established,
with Safety Category 4 indicating designs that require the highest
safety design level. This category is demanded for machines with the
highest level of danger, wherein "serious injury (severed limbs,
death, etc.) will occur frequently, with little chance of escaping
danger." This category demands that a single fault (failure) in any
part of the machine, or a series of faults, will not lead to loss of
the machine's safety functions.
Providing Safety Design Solutions
Automobile manufacturing lines use many
large-scale mechanical devices. Safety circuit design using this type
of equipment required a vast amount of wiring for connections between
circuits and sensors.
Previously, relays were combined to configure safety circuits, but
separate wiring was required for safety control as well as I/O wiring
for machine control. Safety circuits using relays, however, required
increasingly complicated wiring according to the level of equipment
machinery sophistication, making safety circuit changes or additions
difficult. This has created the need to be able to monitor distributed
safety devices and change the production line to adjust to shorter
product life cycles to improve maintenance efficiency.
The DeviceNet Safety System responds to this need with network
compatibility and programmable safety circuits.
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OMRON IA Global
![The NE1A-HDY01 enables easy monitoring and replacement of devices by just connecting to NE0A/NE1A-SCPU0[] with a USB cable.](devicenet_safety_14.jpg)
