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7. Using the contact signal I/O card
5. Contact Signal I/O ratings
●
Signal output (BU and BL)
Photo coupler ratings
Applied voltage: 24V DC or less
Maximum current: 20mA
●
Signal input (BS)
Input voltage: HIGH 5 to 12V DC, LOW 2.5V DC or less
6. Contact Signal I/O circuit of the SC05 card
7. Example of the use of the Contact Signal I/O circuit
7-3 Notes and explanations for the use of
contact signal I/O
BU
BU
BL
3.3V 1.2kΩ
COM
BS
●
Example of the use of the BU signal
●
Example of the use of the BS signal
BU
12V
COM
To port on PC
TLP627
Signal
card side
Connection
cable (twisted
or shielded)
1K
Ω
GND
TLP521
C2458
GND
BS
COM
12V
Connection
cable (twisted
or shielded)
From port
on PC
1.2K
Ω
10K
Ω
Signal
card
side
Notes
When connecting a device that generates counter electromotive force, such as a relay to the signal output
circuit, connect a diode to prevent counter electromotive force across the relay.