Safety at Work has been available since 2000 as the first approved safety networking technology. Over half a million nodes and 50,000 systems have been installed worldwide since its introduction. Safety at Work is an approved safety network that incorporates the required international safety approvals for functional safety. The system is certified by TUV, a Nationally Recognized Testing Laboratory that is recognized by OSHA.
Safety at Work vs. Point-to-Point Safety Wiring
Point-To-Point Wiring
Typically, two redundant contacts are wired to a safety relay A separate normally open contact is wired to the PLC for feedback indication Many wires from one safety device Additional PLC I/O cards are require.
Safety at Work wiring
Feedback wiring is eliminated Eliminates the need for additional PLC cards M12 patch cables used for connecting safety devices to safety input modules One cable from the main control cabinet for safety wiring
Less Material & Labor
Less wire Potential to eliminate Jboxes. Smaller PLC rack. Smaller enclosures. More diagnostics Simpler documentation. Less commissioning time.
Simple Installation & Expansion
Modules connect easily to the bus via insulation displacement connections (IDC).
Mechanically coded flat cable
Mechanically coded flat cable Insulation displacement connectors - simple & safe - protection class up to IP67, - cables reseals up to IP65 piercing connectors
Reducing overall machine cost
Cost comparison on 30 safety inputs with 2 safe zone system
17% savings on small to midsize projects
SAW Installation
Overview of Safety at Work
Safety at Work system: Connect to higher bus system Higher Level Networks: Ethernet IP, Devicenet, Profibus, Profinet
PLC Standard safety devices such as E-stops and door switches
Sensor connections such as Photoelectric and inductive proxs
Network safety relay
Safety Input Modules
Controller
Safety Input Modules
Standard I/O
Two configurable independent safety zones Network Power Supply
Safety Input Modules Safety Intelligent E-stop
Standard I/O
Safety Input Modules
Safety at Work system: Connect directly to PLC
Safety at Work specifications
100 meters max. length per segment; with repeaters up to 300M Single two wire unshielded cable carries input power and communication
Up to 31 safety node addresses per network Standard I/O can be connected on the same network Topology free network
A serial number is transmitted from each safety module to the network relay for safe communication
Max. of 40ms response time Auto Address replacement
Drag and Drop Configuration Tool
Drag and Drop configuration Password protected Allows for an immediate or delay stop function Muting is possible using “OR” logic function Simple software with a short learning curve Addition and changes to safety system is easy
Family of safety modules
Choosing the correct safety module to fit your application
Safety Modules
2 channel safety input module Accepts only normally closed mechanical safety switches Requires only network power Module base is included DIN rail mountable IP67 rated
AC005S
Safety Modules
2 channel safety input module with 2 unsafe outputs Normally closed mechanical safety switches with solenoid locks Outputs rated for up to 1 amp Requires network and 24 VDC power DIN rail mountable IP67 rated
AC006S
Safety Modules
2 channel safety input module for solid state contacts Use for transistor base safety devices such as Light Curtains, Laser scanners, ifm’s GM701S Requires AS-i and 24 VDC power DIN rail mountable IP67 rated AC007S
Safety Modules
2 channel safety input module with 2
OR
unsafe outputs Normally closed mechanical safety devices or magnetic safety sensors Unsafe outputs used for feedback indications Removable combicon screw terminals included DIN rail mountable IP20 rated
AC009S
Safety Modules
Intelligent SAW E-Stop button Safety at Work intelligence built into an Standard field mounted E-Stop Allows for a simple connection directly to the cable without additional safety input module AC010S
IP67 rated
Benefits
Reduced Engineering Time
Fail safe PLC or special masters are not required Safety and standard I/O on one network Easy integration to most PLC’s and Higher level networks Existing safety components such as E-STOP, interlock switches, light curtains etc. can be connected.
Reduced Commissioning Time Eliminates feedback wiring; The status of each safety device is transmitted over a single cable back to the PLC or higher level network
Flexible Modification/expansion Safety I/O modules can be “Snap” into place without running new wires or cables. Safety I/O modules can be remounted and repositioned anywhere on the network cable.
Simple Maintenance Easy replacement of damaged nodes and Safety Monitors
Drag and drop configuration software Changes to safety configuration is easily made; rewiring safety system not needed Password protected
Rated for up to Category 4 (EN954-1), PLe (EN13849-1), SIL 3(IEC61508/IEC62021). Approved by TUV and UL
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