Original instructions – Rockwell Automation 442L SafeZone Singlezone & Multizone Safety Laser Scanner User Manual
Page 51
SafeZone™ Safety Laser Scanner User Manual
10000073050, July 2011 49
R
Original instructions
Without projection of cable fittings with system connector mounted.
For objects with 20% reflectivity.
Core terminating sleeves are not required.
The absolute voltage level must not drop below the specified minimum voltage.
The load currents for the input capacitors are not taken into account.
Applies to the voltage range between U
v
and 0V.
In the case of a fault (the 0V cable is open circuit) the leakage current flows through the OSSD cable as a maximum. The downstream controller must detect this status as LOW. An
FPLC (fail-safe programmable logic controller) must detect this status.
The maximum rated load inductance is higher with lower switching sequence.
Make sure to limit the individual line core resistance to the downstream controller to this value to ensure that a short-circuit between the outputs is safely detected (also
note EN 60 204-1).
When active, the outputs are tested cyclically (brief LOW). When selecting the downstream controllers, make sure that the test pulses do not result in deactivation.
Minimum
Typical
Maximum
Short-circuit current at TxD
-60 mA
60 mA
Max. voltage level at RxD
-11V
11V
Max. voltage level at TxD
-11V
11V
Data interface
Communication protocol
RS-422 (proprietary)
Transmission speed (selectable)
19 200 baud
38 400 baud
125 kbaud
250 kbaud
500 kbaud
Cable length at 500 kbaud and 0.25-mm
2
cables
100 m
Galvanic de-coupling
Yes
Differential output voltage at the sender (between TxD+ and TxD-) with 50 ~ load
±2V
±5V
Differential input threshold at the receiver (between RxD+ and RxD-)
±0.2 V
Short-circuit current at TxD+, TxD
-250 mA
250 mA
Max. voltage level at TxD+, TxD
-29 V
29V
Max. voltage level at RxD+, RxD
-29 V
29V
Terminating resistance
115
Ω
120
Ω
125
Ω
Type of connecting cable
Twisted pairs with copper braid screen
Characteristic impedance of the connecting cable
80
Ω
100
Ω
115
Ω
Cable cross-section of the connecting cable
0.25 mm
2
0.6 mm
2
A
A
B
B
I 400m A
L
I 500m A
L
1/s
L (Hy)
20
10
0
0
1.0
2.0
3.0
4.0