8
P/N 133487
Banner Engineering Corp.
•
Minneapolis, U .S .A .
www .bannerengineering .com • Tel: 763 .544 .3164
SC22-3 Safety Controller
Instruction Manual
Overview
Figure 1-6. Safety Outputs
1.5.2 Safety Outputs
The safety outputs are designed to control final switching
devices (FSDs) and machine primary control elements
(MPCEs) that are the last in the control chain to control the
dangerous motion . These control elements include relays,
contactors, solenoid valves, motor controls and other devices
that incorporate force-guided (mechanically-linked) monitoring
contacts, or control-reliable signals needed for external device
monitoring .
The Safety Controller has three independently controlled and
redundant solid-state safety outputs, each capable of sourcing
750 mA . The Controller‘s self-checking algorithm ensures
that the outputs turn ON and OFF at the appropriate times, in
response to the assigned input signals and the system’s self-
checking test signals .
The safety outputs, SO1, SO2 and SO3, can be controlled by
input devices with both automatic and manual reset operation .
See Section 3 .6 .2 for more information .
Functional Stops per IEC 60204-1 and ANSI NFPA79
The Controller is capable of performing the two functional stop
types:
• Category 0: an uncontrolled stop with the immediate
removal of power from the guarded machine
• Category 1: a controlled stop with a delay before power is
removed from the guarded machine
Delayed stops can be used in applications where, for example,
machines need power for a braking mechanism to stop the hazardous
motion . See Section 3 .6 .2 for more information .
ON-Delays and OFF-Delays
Each safety output can be configured to function with a time delay .
There are two types of time delays: ON-delay and OFF-delay, where
the outputs turn ON or OFF only after the time limit has elapsed . The
ON and OFF time delay limit options are from 100 milliseconds to 5
minutes, in 100 millisecond increments .
Safety output ON-delays are sometimes used when a machine
operation must be delayed before a safe machine startup is
permitted . An example application would be a robot weld cell . See
Section 3 .6 .2 for more information .
WARNING . . .
Turning a Delayed
Output ON/OFF
If an input that is mapped to both an immediate
safety output and a delayed safety output opens
and then closes before the delay time of the delayed output has
expired, the immediate Safety Output will turn OFF and remain OFF
while the delay time is running .
At the end of the delay time, the delayed output will also turn OFF .
Both outputs will then remain OFF for about 500 ms, before they
will turn back ON . This will happen either automatically, if configured
for auto reset, or after a valid manual reset signal, if configured for
manual reset .
SC22-3
OFF-
Delay
Solenoid
Locking Switch
Robot
Contactors