BBH SMX 12-2 - 4.2 Safety related characteristic data and wiring for the connected sensors; 4.2.1 Digital sensors:; 4.2.1.1 Characteristics of sensors; input elements

Installation manual
HB-37350-810-01-51F-EN SMX Installation manual.docx Page 57 of 234
Version: 50F
4.2 Safety related characteristic data and wiring for the connected
sensors
The SMX modules have completely separated signal processing paths for each safety input.
This applies for both the digital and the analog inputs. Furthermore, measures for achieving
the highest possible DC-values have been implemented.
4.2.1 Digital sensors:
Digital inputs and outputs are generally of a completely redundant design, except the electro-
magnetic input terminal. The following list contains details for classification, the DC and the
achievable PI or SIL.
4.2.1.1 Characteristics of sensors / input elements
I
A
O
A
L
A
I
B
O
B
L
B
m
m
i
i
c
i
m
i
m
Sensor PES Aktuator
S
A
S
B
Two-channel input element in parallel connection (Cat. fault tolerance 1) with high DC caused by
signal in two channels and diagnose by means of cross-comparison in the PES
I
A
O
A
L
A
I
B
O
B
L
B
m
m
i
i
c
i
m
i
m
Sensor PES Aktuator
S
A
=K1
K1
K2
S
B
=K2
Two-channel input element in series connection (Cat. 4, fault tolerance 1) with low to medium DC caused by signal
processing in two channels and diagnose by means of cyclic testing
I
A
O
A
L
A
I
B
O
B
L
B
m
m
i
i
c
i
m
i
m
Sensor PES Aktuator
K1
K2
S1
Single channel input element and dual channel processing with low to medium DC by signal processing in two
channels and diagnose by means of cyclic testing, PI / SIL depending on permissible fault exclusions
and test rate for input element.
Actuator
Actuator
Actuator