Table of Contents
Advertisement
6
Safety-related applications
The specifications in this chapter refer to the standard IEC 60508 Edition 2 (2010).
A FMEDA report is available for the JUMO Ex-i isolating switch amplifier; it is available upon request.
chapter 6.15 "Excerpt from FMEDA report", Page 28
6.1
Safety function/wiring
Input
Admissible for safety-related applications:
•
NAMUR sensor (according to EN 60947-5-6)
•
Switching contact with resistance circuit (1 kΩ serial und 10 kΩ parallel; tolerance ±10 %)
Remark: the resistance circuit adjusts the behavior of a NAMUR sensor.
WARNING!
Switching contacts without resistance circuit are admissible for safety-related applications.
Output
The output state follows the input status, i.e. the safety-related function at the output is dependent on the
position of the switch DIP 1 for channel 1 and DIP 3 for channel 2 (set effective direction).
I
= Normal function
II = Inverse function
6.2
Diagnostic function due to switch DIP 2 (channel 1) and DIP 4 (channel 2)
For safety applications, line fault detection is switched on, i.e. the switches DIP 2/DIP 4 are in the posi-
tion "II".
WARNING!
The switch position "DIP 2/DIP 4 = I" is admissible for safety-related applications.
The red LED displays faults that occur when line fault detection is switched on. If a line fault is deter-
mined, the output is switched off (not conductive). This behavior is independent of the position of the
switch DIP1 and DIP3.
6.3
Safe state
The "safe state" of the output is the energy-free state of the relay coil. This means that the normally open
contact is open and the normally closed contact is closed.
When the voltage supply fails or is switched off and when line faults occur, the relay output enters the
safe state.
chapter 4.3 "Operating mode table", Page 16
6.4
Reaction times
After a change of state at the input, the output achieves the safe state in ≤ 40 ms.
6 Safety-related applications
The relay output switches to the state "not conductive" or "open" (normally
open contact) and "conductive" or "closed" (normally closed contact) when
a 0 signal is present (NAMUR sensor high-resistance, therefore low current
in the input circuit).
The relay output switches to the state "not conductive" or "open" (normally
open contact) and "conductive" or "closed" (normally closed contact) when
a 1 signal is present at the input.
21
Advertisement
Table of Contents
