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Chapter 11
Technical Specifications
90
Table 23 - OSSD Specifications
Attribute
Output signal switching device pair
Safe state in case of error
HIGH switching voltage at 250 mA
Switching voltage LOW
(1)
Source switching current
(2)
Leakage current
Load inductance
Load capacity
Switching sequence (without switching
(3)
Permissible cable resistance
(4)
Test pulse width
Test frequency
Power-up delay of the OSSDs from red to green
Time offset on switching the OSSDs between OSSD2 and
OSSD1
(1) Switching currents up to 500 mA are allowed briefly (≤100 ms).
(2) In the case of a fault (0V cable open circuit) maximally the leakage current flows in the OSSD cable. The downstream controller
must detect this status as LOW. An FPLC (fail-safe programmable logic controller) must be able to identify this status.
(3) Make sure to limit the individual line core resistance to the downstream controller to this value to confirm that a cross-circuit
between the outputs is safely detected. (Also note EN 60 204-1.)
(4) When active, the outputs are tested cyclically (brief LOW). When selecting the downstream controllers, make sure that the test
signals do not result in deactivation.
(5) Applies to the voltage range between V
Table 24 - Configuration and Diagnostics Interface Specifications
Attribute
Communication protocol
Transmission speed
Cable length at 38400 Baud and 0.25 mm² cables
Galvanic isolation
Output TxD HIGH
Output TxD LOW
Voltage range RxD
Switching threshold RxD LOW
Switching threshold RxD HIGH
Short-circuit current at TxD
Max. voltage level at RxD
Max. voltage level at TxD
Rockwell Automation Publication 442L-UM005B-EN-P - April 2017
442L-SFZNMN
2 PNP semiconductors, short-circuit protected
cross-circuit monitored
At least one OSSD is in the OFF state.
V
– 2.7 V...V
S
S
0...2 V (0V, typical)
6...250 mA
250 µA
2.2 H
2.2 µF at 50 Ω
5 ¹/s
2.5 Ω
230...300 ms
120 ms
120 ms
2 ms
and 0V.
S
442L-SFZNMN
RS-232 (proprietary)
38400 Bauds
15 m (49 ft)
No
5...15 V
-15...-5 V
-15...+15 V
-15...+0.4 V
2.4...15 V
-60...+60 mA
-15...+15 V
-11...+11 V
(5)
,
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