LM master modbus, PLC slave

[Simuzer]

hi all.

I have a modbus project that LM is Master and Wago PLC Slave. Using word and bits..

I read and write data as word but i don't read and write any bit of word..

I dont use modbus mapping . I love script more easy.

Code:

require('luamodbus')
mb = luamodbus.tcp()
mb:open('192.168.1.102', 502)
mb:connect()
  -- -- --
    value = grp.getvalue('32/1/2')
  mb:writeregisters(0, value)
    value = grp.getvalue('32/1/3')
  mb:writeregisters(1, value)
  value = mb:readregisters(2)
    grp.update('32/1/4', value)
  -- -- --
  -- -- --
    value = grp.getvalue('32/1/5')
  mb:writeregisters(3, value)
    value = grp.getvalue('32/1/6')
  mb:writeregisters(4, value)
  value = mb:readregisters(5)
    grp.update('32/1/7', value)
  -- -- --
-- bolean --
   valuew6 = mb:readregisters(6) --read w6
  -- w6.0 -- read 0. bit of w6
    if (grp.getvalue('32/1/8')) then
        valuew6 = valuew6 or 1                -- set » xxxx xxxx xxxx xxx(1)
  else
    valuew6 = valuew6 and 65534        -- set » xxxx xxxx xxxx xxx(0)
  end
  -- --
  -- w6.1 --  read 1. bit of w6
    if (grp.getvalue('32/1/9')) then
        value6 = value6 or 2                -- set » xxxx xxxx xxxx xx(1)x
  else
    value6 = value6 and 65533        -- set » xxxx xxxx xxxx xx(0)x
  end
    -- --
  -- w6.2 -- write 2. bit of w6
     bValue = (value6 and 4)            -- set » 0000 0000 0000 0(x)00
     if (bValue==4) then
       grp.update('32/1/10', true)       -- set » xxxx xxxx xxxx x(1)xx
   else
       grp.update('32/1/10', false)       -- set » xxxx xxxx xxxx x(0)xx
   end
  mb:writeregisters(6, value06)
    grp.update('32/1/11', value06)
 
mb:close()

   

   

[CristianAgata]

Hi,
Look at this if can help you.
https://forum.logicmachine.net/showthrea...t=Bit+mask
BR Cristian

[Simuzer]

Thank you for your reply. But thats not work correctly.

When changing one bit, the other bits should not change. 

Hi,
Look at this if can help you.
https://forum.logicmachine.net/showthrea...t=Bit+mask
BR Cristian

[admin]

That's exactly why you should use profiles because it's already handled there

You are using logical and / or in your script. Use bit.band / bit.bor instead.