Rockwell Automation 442L SafeZone Singlezone & Multizone Safety Laser Scanner - Manual (Page 51)

SafeZone™ Safety Laser Scanner User Manual
10000073050, July 2011 49
R
Original instructions
Œ
Without projection of cable fittings with system connector mounted.

For objects with 20% reflectivity.
Ž
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