X64 Xcelera-CL PX4 User's Manual Appendix: X-I/O Module Option • 109
Opto-coupled Input: Electrical Details
The two opto-coupled inputs can be used either with TTL or RS422 sources. A simplified input schematic
and important electrical specifications are listed below.
X-I/O Input
GND
Simplified
Opto-coupled
Input
typical 2 places
1
20
2
21
X-I/O Module
Opto-Coupled Input
DB37
Connector
In_Opto_1+
In_Opto_1-
In_Opto_2+
In_Opto_2-
Input reverse breakdown voltage 5 volts minimum
Maximum average forward input current 25 mA
Maximum input frequency 200 kHz
Maximum Sapera call-back rate System processing dependent
TTL Input Electrical Details
The six TTL inputs are software configurable (see "Configuring User Defined Power-up I/O States" on
page 110) for standard TTL logic levels or industrial logic systems (typically 24 volts). The design switch
points are as follows:
• TTL level mode : trip point at 2V +/- 5%
• Industrial level mode: trip point at 16V +/- 5%
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