Safety at Work: A simple way to wire safety

Safety at Work:
A simple way to wire safety
SAFETY AT WORK
Updated: 6/25//2009
What is 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.
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
Complete sensor solution provider
ifm can also provide your sensing component and cable needs