90 Rockwell Automation Publication 442L-UM005B-EN-P - April 2017
Chapter 11 Technical Specifications
Table 23 - OSSD Specifications
Table 24 - Configuration and Diagnostics Interface Specifications
Attribute 442L-SFZNMN
Output signal switching device pair 2 PNP semiconductors, short-circuit protected
(5)
,
cross-circuit monitored
(5) Applies to the voltage range between V
S
and 0V.
Safe state in case of error At least one OSSD is in the OFF state.
HIGH switching voltage at 250 mA V
S
– 2.7 V…V
S
Switching voltage LOW 0…2 V (0V, typical)
Source switching current
(1)
(1) Switching currents up to 500 mA are allowed briefly (≤100 ms).
6…250 mA
Leakage current
(2)
(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.
250 µA
Load inductance 2.2 H
Load capacity 2.2 µF at 50 Ω
Switching sequence (without switching 5 ¹/s
Permissible cable resistance
(3)
(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.)
2.5 Ω
Test pulse width
(4)
(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.
230…300 ms
Test frequency 120 ms
Power-up delay of the OSSDs from red to green 120 ms
Time offset on switching the OSSDs between OSSD2 and
OSSD1
2 ms
Attribute 442L-SFZNMN
Communication protocol RS-232 (proprietary)
Transmission speed 38400 Bauds
Cable length at 38400 Baud and 0.25 mm² cables 15 m (49 ft)
Galvanic isolation No
Output TxD HIGH 5…15 V
Output TxD LOW -15…-5 V
Voltage range RxD -15…+15 V
Switching threshold RxD LOW -15…+0.4 V
Switching threshold RxD HIGH 2.4…15 V
Short-circuit current at TxD -60…+60 mA
Max. voltage level at RxD -15…+15 V
Max. voltage level at TxD -11…+11 V
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