3-303 4. Inputs and outputs on connector X4Connection Interface Circuit (Input)Input CircuitSI Connection to sequence input signals Relatedcontrol mode P S T F• Connect to contacts of switches and relays, or open collector output transistors.• When you use contact inputs, use the switches and relays for micro current to avoid contactfailure.• Make the lower limit voltage of the power supply (12 to 24V) as 11.4V or more in order tosecure the primary current for photo-couplers.PI1 Connection to sequence input signals (Pulse train interface) Relatedcontrol mode P S T F(1) Line driver I/F (Input pulse frequency : max. 500kpps)• This signal transmission method has better noise immunity.We recommend this to secure the signal transmission.(2) Open collector I/F (Input pulse frequency : max. 200kpps)• The method which uses an external control signal power supply (VDC)• Current regulating resistor (R) corresponding to V DC isrequired in this case.• Connect the specified resister as below.• (R) should be placed close to the driver for effective noise reduction.(3) Open collector I/F (Input pulse frequency : max. 200kpps)• Connecting diagram when a current regulating resistor is notused with 24V power supply.12 to 24V COM+4.7kΩSRV-ON etc.RelayCOM+4.7kΩRelaySRV-ON etc.VDC12V24VSpecifications1kΩ1/2W2kΩ1/2WVDC –1.5R+220.=. 10mA(1)(2)(3)3 PULS14 PULS2220ΩV DCR5 SIGN16 SIGN2220Ω2.2kΩ2.2kΩR1 OPC14 PULS2220Ω24V DC2 OPC16 SIGN2220Ω2.2kΩ2.2kΩ2.2kΩ2.2kΩ1 OPC14 PULS2220Ω2 OPC16 SIGN2220Ω2.2kΩ2.2kΩ2.2kΩ2.2kΩ13 1313Max.input voltage :DC24V, Rated current : 10mArepresents twisted pair.