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+--- Thread: LM master modbus, PLC slave (/showthread.php?tid=5731)
LM master modbus, PLC slave - Simuzer - 09.11.2024
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
![[Image: smile.png]](https://forum.logicmachine.net/images/smilies/smile.png)
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()RE: LM master modbus, PLC slave - CristianAgata - 10.11.2024
Hi,
Look at this if can help you.
https://forum.logicmachine.net/showthread.php?tid=5510&highlight=Bit+mask
BR Cristian
RE: LM master modbus, PLC slave - Simuzer - 10.11.2024
Thank you for your reply. But thats not work correctly.
When changing one bit, the other bits should not change.
(10.11.2024, 08:13)CristianAgata Wrote: Hi,
Look at this if can help you.
https://forum.logicmachine.net/showthread.php?tid=5510&highlight=Bit+mask
BR Cristian
RE: LM master modbus, PLC slave - admin - 11.11.2024
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.