Safety at Work: A simple way to wire safety

Updated: 6/25//2009

SAFETY AT WORK

� 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.

What is Safety at Work?

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 wire

� Potential to eliminate J-boxes.

� Smaller PLC rack.

� Smaller enclosures.

� More diagnostics

� Simpler documentation.

� Less commissioning time.

Less Material & Labor

� Modules connect easily to the bus via insulation displacement connections (IDC).

� Mechanically coded flat cable

� Insulation displacement connectors- simple & safe- protection class up to IP67,- cables reseals up to IP65

Simple Installation & Expansion

piercing connectors

Mechanically codedflat cable

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

Network

safety

relay

Network

Power Supply

Controller

Safety

Input

Modules

Safety

Input

Modules

Safety

Intelligent

E-stop

Safety

Input

Modules

Safety

Input

Modules

Standard

I/O

Standard

I/O

Standard safety devices such as

E-stops and door switchesSensor connections such as

Photoelectric and inductive proxs

Two configurable independent

safety zones

Safety at Work system:Connect directly to PLC

� 100 meters max. length per segment; with repeaters up to 300M

� Single two wire unshielded cable carries input power and communication

� A serial number is transmitted from each safety module to the network relay for safe communication

Safety at Work specifications

� Up to 31 safety node addresses per network

� Standard I/O can be connected on the same network

� Topology free network

� 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 appl ication

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

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

OR

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

� IP67 ratedAC010S

� 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

Benefits

Complete sensor solution provider

ifm can also provide your sensing component and cable needs