3 interlocked guard or gate, 1 safety circuit integrity levels – Banner SC22-3E Safety Controller with Ethernet User Manual
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Fault Exclusion must be used to achieve a higher level of safety
circuit integrity.
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 device(s). 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
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.
OFF
OFF
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 device. This circuit can detect a
short circuit between channels. In the actuated condition (e.g., S1
open/S2 closed below), 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
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 device. This circuit can detect a
short circuit between channels. In the actuated condition (e.g., S1
OFF/S2 ON 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
10.3 Interlocked Guard or Gate
The Safety Controller safety inputs may be used to monitor electrically interlocked guards or gates.
10.3.1 Safety Circuit Integrity Levels
Requirements vary widely for the level of control reliability or safety category per ISO 13849-1 (EN954-1) in the application of interlocked
guards. While Banner Engineering always recommends the highest level of safety in any application, it is the responsibility of the user to
safely install, operate and maintain each safety system and comply with all relevant laws and regulations.
SC22-3/-3E Safety Controller Instruction Manual
P/N 133487 rev. C
www.bannerengineering.com - tel: 763-544-3164
93