logixDuino.py

from pyfirmata import Arduino, util
import time
from eip import PLC

def boolean_read(tag):
  '''
  simple tag read
  '''
  return comm.Read(tag)

# define our pylogix communication
# change to your softlogix plc IP!
# change to your softlogix slot!
comm = PLC()
comm.IPAddress = '192.168.0.15'
comm.ProcessorSlot = 2

# Legacy code straight serial requires constant arduino code updates
# not a bad thing, if you aren't using regular IO
# serial example
# s = serial.Serial('COM3', 9600, timeout=1)
# time.sleep(5)
# #s.write(b'2')

# while True:
# 	if not close_serial:
# 		if led_status:
# 			s.write(b'1')
# 		if not led_status:
# 			s.write(b'2')
# 		time.sleep(0.3)

# s.close()

# firmata example
# two controller tags from PLC
close_serial = boolean_read('Close_Serial')
led_status = boolean_read("Led_On")

# define com port and iterator
board = Arduino("COM3")
it = util.Iterator(board)
it.start()

# define hardware input, and output
sw = board.get_pin('d:2:i')
led = board.get_pin('d:13:o')

# run while close_serial is false
while not close_serial:
	sw_value = sw.read()
	led_status = boolean_read("Led_On")
	close_serial = boolean_read('Close_Serial')

	# if hardware sw is pushed we
	# send bit to softlogix tag program tag Turn_Led
	if sw_value == 1:
		comm.Write("Program:MainProgram.Turn_Led", 1)
	else:
		comm.Write("Program:MainProgram.Turn_Led", 0)

	# if Controller tag Led_On is True turn LED on pin 13
	if led_status:
		led.write(1)
	else:
		led.write(0)

board.exit()