Banner SC22-3E Safety Controller with Ethernet - Manual (Page 16)

2.6.2 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 con-
trols and other devices that incorporate force-guided (mechanically-linked) monitoring contacts, or control-reliable signals needed for ex-
ternal device monitoring.
The Safety Controller has three independently controlled and redundant solid-state Safety Outputs. The Controller’s self-checking algo-
rithm 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.
Figure 7. Safety Outputs
Legend:
1. Safety Controller
2. OFF-Delay
3. Solenoid locking switch
4. Robot
5. Contactors
See section 4.7.2 Safety Outputs on page 41 for more information about configuring Safety Outputs.
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.
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.
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/-3E Safety Controller Instruction Manual
16 www.bannerengineering.com - tel: 763-544-3164 P/N 133487 rev. C