Programmable Logic Controllers and Their Engineering Applications

Address Instruction Data analogue signal auxiliary relay binary number BLOCK instruction Chapter circuit shown coil components connected to bit connected to CR1 contact IN1 CONTROL PROBLEM control relay convert count CR1 and CR2 CR1 is energized d.c. motor Data 0 LOAD delay-off timer delay-on DESCRIPTION OF CONTROL device END End example Figure function GRAFCET heater hexadecimal image memory IN1 and IN2 IN1 CR1 IN1 IN2 IN1 is turned input port Input/output interface ladder circuit ladder code ladder diagram ladder line ladder program latch circuit LOAD IN1 logic normally open octal Omron operation opto-isolated output port palletizer Parallel communication parallel port parity photoelectric switch pneumatic pistons port called port preset value production line programmable logic controller proxistor pulses RESET C1 Resetting a latch scan sequencing shift register shown in Fig snubber solenoid solenoid S1 speed stored subcircuits subroutine thermocouple transistor voltage нн