I/O Connector
Pin Name Electrical Specification
Signal Description
VI1+
• Isolated input
• 5–24 VDC
• 20 mA maximum
• 200 μs minimum pulse with reverse polarity
protection
The Voltage Initiate 1 signal triggers a dispense cycle
for channel 1 when a 5–24 VDC signal is applied
across the VI1+ and VI1- pins.
VI1-
• Isolated return path for VI1+ input
EOC1+
• Isolated output switch
• 5–24 VDC
• 100 mA maximum
• Resettable fuse
• Reverse polarity and transient overvoltage
protection
The End of Cycle 1 signal pair is an isolated
electronic switch output.The switch opens during a
channel 1 dispense cycle and closes when the cycle
completes.
EOC1-
• Isolated return path for EOC1+ output
VI2+
• Isolated input
• 5–24 VDC
• 20 mA maximum
• 200 μs minimum pulse with reverse-polarity
protection
Refer to the VI1+ description.
VI2-
• Isolated return path for the VI2+ input
EOC2+
• Isolated output switch
• 5–24 VDC
• 100 mA maximum
• Resettable fuse
• Reverse polarity and transient overvoltage
protected
Refer to the EOC1+ description.
EOC2-
• Isolated return path for the EOC2+ output
AI+
• Output from a 24 VDC source
• 100 mA maximum
• Resettable fuse
• Reverse polarity-protected for connection
to the AI- input
The Alarm Input pin pair senses a closed circuit
switch OPENING. When an AI open circuit is
sensed, the controller will display the System Alarm
screen and prevent any further dispense cycles
from initiating. This signal can be disabled. Refer to
“Setting Alarm Options.”
AI-
• AI closure sense input
• 5–24 VDC
• 20 mA maximum
• reverse-polarity protected
• 10 ms minimum pulse, not isolated
Continued on next page
Appendix A, Connector Pin Technical Data (continued)
ValveMate 9000 Controller
64
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