2 rope pull hookup options, Second set of contacts opens; see section – Banner SC22-3E Safety Controller with Ethernet User Manual
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10.8.2 Rope Pull Hookup Options
The device is shown in the armed (Run) state.
Single-Channel (1 terminal, 2 terminals or PNP device): These
circuits can typically meet ISO 13849-1 Category 2 requirements,
depending on the design and installation of the switch. At a mini-
mum, to achieve a Category 2, the switch must be a safety-rated
device. The 1-terminal and the PNP device can not detect a short
circuit to another source of power. Two-terminal hookup uses
pulse monitoring and can detect a short circuit to another source of
power. Fault Exclusion must be used to achieve higher level of
safety circuit integrity.
24V
Dual-Channel (2 or 3 terminals): This circuit typically can meet
ISO 13849-1 Category 3 requirements, depending on the safety
rating and installation of the switch. Dual-channel 3-terminal hook-
up uses pulse monitoring and can detect a short circuit to another
source of power. Both 2- and 3-terminal hook up can detect a short
between channels when the contacts are open if the short is
present longer than 2 seconds.
24V
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 device. This circuit can detect a short cir-
cuit between channels or to another source of power.
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. This circuit can detect a
short circuit between channels. In the actuated condition (e.g., S1
closed/S2 open 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 (selected) debounce time, see section
24V
S1
S2
S1
S2
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. This circuit can detect a
short circuit between channels. In the actuated condition (e.g., S1
ON/S2 OFF 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 (selected) debounce time, see section
ON
OFF
S1
S2
SC22-3/-3E Safety Controller Instruction Manual
P/N 133487 rev. C
www.bannerengineering.com - tel: 763-544-3164
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