Question

我在GitHub上发现了pylogix，并一直在AB L71 CPU上读写标签。我在读/写部分很成功，但是我想做的是基于plc值大于0触发GPIO引脚输出。

我似乎无法弄清楚将不断更新的值输入输出函数所需要做的事情。

import threading
from pylogix.eip import PLC
from gpiozero import LED
from time import sleep

comm = PLC()
comm.IPAddress = '10.201.191.177'

def readdata():
    threading.Timer(1.0, readdata).start()
    x = comm.Read('parts')
    print (x)
readdata()

if x > 0:
relay = LED(2)

Answer 1

很高兴看到我不是这个论坛上唯一对PLC感兴趣的人。我可能会为您推荐：

编辑：我阅读了您模块的文档。在下面尝试这个新代码可以找到文档https://gpiozero.readthedocs.io/en/stable/

import threading # I don't think this is necessity for your application
import time
from pylogix.eip import PLC
from gpiozero import LED
from time import sleep

with PLC() as comm #small edit here to control the closing of sockets upon exit
    comm.IPAddress = '10.201.191.177'
    running=True
    relay = LED(2) #I believe the previous version of your code was constantly overwriting your 'relay' variable with a new instance of class LED
    while running==True:
        x=comm.read('parts')
        if x > 0:
            relay.on()
        else: relay.off()
    time.sleep(.5)
#this will run forever updating your LED every 500ms, I would recommend writing code to exit this loop

Raspberry Pi到AB controllogix：如何基于连续读取plc标签值来触发GPIO中的输出

1 个答案: