Banner SC22-3E Safety Controller with Ethernet - Manual (Page 42)

OSSD Output Connections
The output signal switching device (OSSD) outputs must be connected to the machine control such that the machine’s safety related
control system interrupts the circuit or power to the machine primary control element(s) (MPCE), resulting in a non-hazardous condition.
Final switching devices (FSDs) typically accomplish this when the Safety Outputs go to the OFF state.
Refer to the output specifications on page 23 and Warning below before making OSSD connections and interfacing the Controller to the
machine.
ON-Delays and OFF-Delays
Each Safety Output can be configured to function with either an ON-delay or an OFF-delay (see Figure below), where the output turns
ON or OFF only after the time limit has elapsed. An output cannot have both ON- and OFF-delays. The ON and OFF time delay limit
options are from 100 milliseconds to 5 minutes, in 100 millisecond increments.
Current operation is to honor the OFF-delay for internal and system faults, whenever possible.
Safety Input
SO 1
(ON-Delay)
SO 2
(OFF-Delay) Delay Delay Delay
Delay Delay Delay
500 ms 500 ms 500 ms
Figure 27. Timing logic: Safety Output with OFF-delay
NOTICE: Safety Outputs are Dual-Channel.
An individual Safety Output is not, by itself, capable of meeting Category 4 applications (per ISO13849-1). When the risk assessment or
relevant regulations require high levels of safety integrity (i.e., Category 4), both the output signal switching device (OSSD) outputs
must be connected to the machine control so that the machine’s safety related control system interrupts the circuit or power to the
machine primary control element(s) (MPCEs), resulting in a non-hazardous condition.
Final switching devices (FSDs) typically accomplish this when the OSSDs go to an OFF state. See wiring diagrams.
WARNING: . . . OFF-Delays
A Safety Output OFF-delay time will be honored even if the safety input that caused the OFF-delay timer to start switches
back to the Run state before the delay time expires. However, in cases of a power interruption or a power loss, an OFF-
delay time can end immediately. If such an immediate machine stop condition could cause a potential danger, then
additional safeguarding measures must be taken to prevent injuries.
WARNING: . . . Interfacing of Both OSSDs
Both of the OSSD (Output Signal Switching Device) outputs must be connected to the machine control so that the
machine’s safety-related control system interrupts the circuit to the machine primary control element(s), resulting in a non-
hazardous condition.
Never wire an intermediate device(s) (e.g., PLC, PES, or PC) that can fail in such a manner that there is the loss of
the safety stop command, OR in such a manner that the safety function can be suspended, overridden, or defeated,
unless accomplished with the same or greater degree of safety.
SC22-3/-3E Safety Controller Instruction Manual
42 www.bannerengineering.com - tel: 763-544-3164 P/N 133487 rev. C