Te tāuta i ngā wehewehe tohu ki ngā kāpata whakahaere PLC

I roto i te ao o te aunoatanga ahumahi, he mahi nui tā ngā kāpata whakahaere PLC (Programmable Logic Controller), e kawenga ana mō te whiwhi tohu mai i ngā pūoko me ngā kaiwhakaoho, me te whakatutuki i te whakahaere tika o te tukanga whakaputa mā roto i ngā mahi arorau ā-roto. Heoi, i roto i ngā mahi whaihua, he maha ngā wā ka pāngia ngā kāpata whakahaere PLC e ngā taiao hikohiko uaua me ngā raruraru pokanoa tohu, ka arahi pea ki ngā hapa o te pūnaha whakahaere, ngā rahunga maha, ā, ka tū hei mōrearea ki te haumaru o ngā taputapu me ngā kaimahi. Nō reira, me tāpiri atu tohu motuhakeKua noho te hononga o ngā kaiwhakahaere ki ngā kāpata whakahaere PLC hei otinga noa.

Ko ngā mahi matua a ngā kaiwhakawehe tohu ko te aukati i te tuku i te pokanoa hikohiko, te whakaiti i te puta o ngā rahunga pūnaha, me te whakarato i te wehenga mēnā ka rahunga ngā taputapu i te papaanga, me te aukati i te horapa o ngā hapa ki te pūnaha whakahaere katoa. Mā te whakarerekē me te whakawhiti i ngā tohu e whiwhihia ana e te PLC mā roto i ngā taputapu haurua-ira, kātahi ka wehea me te huri i a rātou mā te whakamahi i ngā taputapu pūoko whatu, aukume rānei, ā, i te mutunga ka whakakorengia me te huri i a rātou ki te tohu taketake, ki ngā tohu rerekē rānei, ka whakarite tēnei tukanga i te pumau me te tika o te tohu, me te ārai hoki i te kino ki te PLC me te whakaiti i te pānga o ngā tohu i te papaanga ki te PLC, inā koa ngā tohu raruraru. Hei tāpiri, ka taea hoki e ngā kaiwhakawehe tohu te whakatutuki i te hurihanga tohu, pērā i te huri i ngā tohu mai i ngā hononga PT10 ki ngā tohu 4-20mA me te whakauru i a rātou ki roto i ngā pūnaha PLC, me te karo i ngā taupatupatu i waenga i te hiko me ngā pūtake hiko me te whakaoti i te raruraru o te pokanoa i waenga i ngā koropiko me ngā taputapu.

I roto i ngā tono motuhake, pērā i te raina whakaputa o te tipu maitai, ka tutukihia te ine me te whakahaere mā te PLC, ngā taputapu aunoa i te papaanga, me ngā kaiwhakaoho i te papaanga. Ka whakanohoia te PLC ki roto i tētahi kāpata whakahaere kei te rau mita te tawhiti atu i te papaanga (e mahi ana i te pāmahana rūma), ā, ka tukuna ngā tohu e ngā taputapu aunoa, e ngā takirua wera rānei mai i te papaanga mā roto i ngā waea ki roto i te kāpata whakahaere i roto i te rūma whakahaere. I tēnei wā, me wehe te tohu e tomo ana ki te PLC, ā, me huri pea, pērā i te wehe i te 4-20mA me te huri ki te 0-5V i mua i te tomo ki te PLC. Ko te taputapu e whakaoti ana i te wehe me te huri i ngā tohu takirua wera ka kiia he "kaiwehe tohu takirua wera" he "kaituku pāmahana takirua wera" rānei. Ko tana mahi matua ko te wehe i te tohu whakauru me te tohu putanga, me te huri i te tohu taumata mV whakauru mai i te takirua wera ki ngā tohu ahumahi paerewa (4-20mA, 0-5V, 0-10V).

Hei whakarāpopototanga, he mea nui te tāuta i ngā taputapu wehewehe tohu hei whakapai ake i te pono o ngā pūnaha aunoatanga ahumahi, hei whakaiti i ngā reiti rahunga, hei tiaki i ngā taputapu PLC, hei whakapai ake hoki i te kounga tohu. Ko tētahi o ngā wāhanga nui hei whakarite i te pumau me te pono o te mahi a ngā pūnaha whakahaere.