Banner SC22-3E Safety Controller with Ethernet User Manual
Page 97
Dual-Channel (2 or 3 terminals): This circuit typically can meet
ISO 13849-1 Category 2 or Category 3 requirements, depending
on the safety rating and installation of the switch(es). Dual Channel
3-terminal hookup uses pulse monitoring and can detect a short
circuit to another source of power. Both 2- and 3-terminal hookup
can detect a short between channels when the contacts are open if
the short is present longer than 2 seconds.
24V
24V
24V
A single switch
mounted on a single
guard is typically a
Category 2
applicaton.
Two switches
individually mounted
on a single guard is
typically a Category
3 applicaton.
Dual-Channel (PNP device): This circuit can meet ISO 13849-1
Category 2, 3, or 4 requirements depending on the safety rating,
installation, and the fault detection (e.g., short circuit) capabilities
of the device. The Safety Controller does not provide short circuit
detection in this configuration.
ON
ON
Dual-Channel (4 terminals): This circuit can meet ISO 13849-1
Category 2, 3, or 4 requirements, depending on the safety rating
and the installation of the switch(es). This circuit can detect a short
circuit between channels or to another source of power.
Two switches individually
mounted on a single guard is
typically a Category 4 applica-
tion. A series connection of
switches on multiple guards is
typically a Category 3 applica-
tion.
One switch mounted on a single
guard is typically a Category 2
application.
Complementary (2 or 3 terminals): This circuit can meet ISO
13849-1 category 2, 3, or 4 requirements depending on the safety
rating and the installation of the switch(es). This circuit can detect
a short circuit between channels. A coded magnetic switch would
typically use this style. In the guard-closed condition (as shown), a
short across the closed contact can cause the response time to in-
crease based on the debounce time. In this situation, the response
time could be longer than specified, based on the (selected) de-
bounce time, see section
4.3.2 Safety Input Device Properties
page 28.
24V
24V
A single coded magnetic switch mounted
on a single guard can meet Category 3 or 4
depending on installation and the
frequency of exercising the guard (closed-
open-closed). For more information, see
the GM-FA-10J data sheet (p/n 60998).
Complementary (PNP device): This circuit can meet ISO
13849-1 category 2, 3, or 4 requirements depending on the safety
rating and the installation of the switch(es). This circuit can detect
a short circuit between channels. In the guard-closed condition (as
shown), a short across the closed contact can cause the response
time to increase based on the debounce time. In this situation, the
response time could be longer than specified, based on the (selec-
ted) debounce time, see section
4.3.2 Safety Input Device Proper-
on page 28.
OFF
ON
SC22-3/-3E Safety Controller Instruction Manual
P/N 133487 rev. C
www.bannerengineering.com - tel: 763-544-3164
97