<\/span><\/h2>\nPLC<\/strong> (Programmable Logic Controller) l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb \u0111i\u1ec1u khi\u1ec3n t\u1ef1 \u0111\u1ed9ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong ng\u00e0nh c\u00f4ng nghi\u1ec7p \u0111\u1ec3 \u0111i\u1ec1u khi\u1ec3n v\u00e0 gi\u00e1m s\u00e1t c\u00e1c quy tr\u00ecnh t\u1ef1 \u0111\u1ed9ng. N\u00f3 \u0111\u01b0\u1ee3c l\u1eadp tr\u00ecnh \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 c\u1ee5 th\u1ec3 v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng x\u1eed l\u00fd th\u00f4ng tin t\u1eeb c\u00e1c c\u1ea3m bi\u1ebfn v\u00e0 thi\u1ebft b\u1ecb \u0111\u1ea7u ra.<\/p>\nC\u1ea5u tr\u00fac ch\u00ednh c\u1ee7a m\u1ed9t PLC bao g\u1ed3m m\u1ed9t b\u1ed9 vi x\u1eed l\u00fd, b\u1ed9 nh\u1edb, c\u00e1c c\u1ed5ng k\u1ebft n\u1ed1i v\u00e0 c\u00e1c module I\/O (Input\/Output). B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng ph\u1ea7n m\u1ec1m l\u1eadp tr\u00ecnh, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh \u0111i\u1ec1u khi\u1ec3n cho PLC \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 nh\u01b0 ki\u1ec3m so\u00e1t qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t, \u0111o l\u01b0\u1eddng v\u00e0 gi\u00e1m s\u00e1t d\u1eef li\u1ec7u, v\u00e0 \u0111i\u1ec1u khi\u1ec3n c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 motor, van v\u00e0 c\u1ea3m bi\u1ebfn.<\/p>\n
M\u1ed9t s\u1ed1 h\u00e3ng s\u1ea3n xu\u1ea5t PLC n\u1ed5i ti\u1ebfng bao g\u1ed3m Siemens, Allen-Bradley (Rockwell Automation), Mitsubishi Electric v\u00e0 Schneider Electric.<\/p>\n
<\/span>2. C\u1ea5u t\u1ea1o v\u00e0 nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a PLC<\/span><\/h2>\nM\u1ed9t chi\u1ebfc PLC th\u00f4ng th\u01b0\u1eddng bao g\u1ed3m ba th\u00e0nh ph\u1ea7n ch\u00ednh: b\u1ed9 vi x\u1eed l\u00fd (CPU), b\u1ed9 nh\u1edb v\u00e0 c\u00e1c module I\/O. CPU l\u00e0 tr\u00e1i tim c\u1ee7a PLC, n\u01a1i x\u1eed l\u00fd c\u00e1c t\u00e1c v\u1ee5 \u0111i\u1ec1u khi\u1ec3n v\u00e0 qu\u1ea3n l\u00fd d\u1eef li\u1ec7u. B\u1ed9 nh\u1edb \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u01b0u tr\u1eef ch\u01b0\u01a1ng tr\u00ecnh \u0111i\u1ec1u khi\u1ec3n v\u00e0 d\u1eef li\u1ec7u li\u00ean quan. C\u00e1c module I\/O \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 k\u1ebft n\u1ed1i v\u1edbi c\u00e1c thi\u1ebft b\u1ecb \u0111\u1ea7u v\u00e0o (sensors) v\u00e0 \u0111\u1ea7u ra (actuators).<\/p>\n
Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a PLC d\u1ef1a tr\u00ean vi\u1ec7c th\u1ef1c hi\u1ec7n m\u1ed9t chu\u1ed7i c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh \u0111i\u1ec1u khi\u1ec3n \u0111\u01b0\u1ee3c l\u1eadp tr\u00ecnh tr\u01b0\u1edbc. Khi ho\u1ea1t \u0111\u1ed9ng, PLC nh\u1eadn t\u00edn hi\u1ec7u t\u1eeb c\u00e1c c\u1ea3m bi\u1ebfn th\u00f4ng qua module I\/O \u0111\u1ea7u v\u00e0o, sau \u0111\u00f3 x\u1eed l\u00fd th\u00f4ng tin n\u00e0y theo ch\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 \u0111\u01b0\u1ee3c l\u1eadp tr\u00ecnh v\u00e0 cu\u1ed1i c\u00f9ng g\u1eedi t\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n cho c\u00e1c thi\u1ebft b\u1ecb \u0111\u1ea7u ra th\u00f4ng qua module I\/O \u0111\u1ea7u ra.<\/p>\n
PLC ho\u1ea1t \u0111\u1ed9ng theo nguy\u00ean t\u1eafc “scan cycle” – qu\u00e9t chu k\u1ef3. Trong m\u1ed7i chu k\u1ef3, PLC th\u1ef1c hi\u1ec7n c\u00e1c b\u01b0\u1edbc sau: <\/p>\n
\n- Qu\u00e9t<\/strong>: \u0110\u1ecdc t\u00edn hi\u1ec7u t\u1eeb c\u00e1c c\u1ea3m bi\u1ebfn v\u00e0 ghi l\u1ea1i gi\u00e1 tr\u1ecb trong b\u1ed9 nh\u1edb.<\/li>\n
- X\u1eed l\u00fd<\/strong>: X\u1eed l\u00fd c\u00e1c t\u00e1c v\u1ee5 \u0111i\u1ec1u khi\u1ec3n v\u00e0 t\u00ednh to\u00e1n d\u1ef1a tr\u00ean ch\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 \u0111\u01b0\u1ee3c l\u1eadp tr\u00ecnh.<\/li>\n
- \u0110i\u1ec1u khi\u1ec3n<\/strong>: G\u1eedi t\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb \u0111\u1ea7u ra \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c h\u00e0nh \u0111\u1ed9ng c\u1ea7n thi\u1ebft.<\/li>\n
- L\u1eb7p l\u1ea1i<\/strong>: Qu\u00e1 tr\u00ecnh qu\u00e9t chu k\u1ef3 \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i li\u00ean t\u1ee5c \u0111\u1ec3 duy tr\u00ec ho\u1ea1t \u0111\u1ed9ng c\u1ee7a PLC.<\/li>\n<\/ul>\n
Qu\u00e1 tr\u00ecnh n\u00e0y gi\u00fap PLC th\u1ef1c hi\u1ec7n vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n t\u1ef1 \u0111\u1ed9ng trong c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 v\u00e0 ch\u00ednh x\u00e1c.<\/p>\n
<\/span>3. \u1ee8ng d\u1ee5ng c\u1ee7a PLC trong c\u00f4ng nghi\u1ec7p<\/span><\/h2>\n<\/span>3.1 \u0110i\u1ec1u khi\u1ec3n qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t<\/span><\/h3>\nPLC \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c quy tr\u00ecnh s\u1ea3n xu\u1ea5t c\u00f4ng nghi\u1ec7p \u0111\u1ec3 \u0111i\u1ec1u khi\u1ec3n v\u00e0 gi\u00e1m s\u00e1t c\u00e1c ho\u1ea1t \u0111\u1ed9ng t\u1ef1 \u0111\u1ed9ng. V\u1edbi kh\u1ea3 n\u0103ng x\u1eed l\u00fd t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o v\u00e0 ra, PLC c\u00f3 th\u1ec3 ki\u1ec3m so\u00e1t c\u00e1c thi\u1ebft b\u1ecb nh\u01b0 m\u00e1y m\u00f3c, c\u1ea3m bi\u1ebfn, van v\u00e0 motor theo c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh logic \u0111\u01b0\u1ee3c l\u1eadp tr\u00ecnh tr\u01b0\u1edbc. \u0110i\u1ec1u n\u00e0y gi\u00fap t\u0103ng t\u00ednh ch\u00ednh x\u00e1c v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t.<\/p>\n
<\/span>3.2 H\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n an to\u00e0n<\/span><\/h3>\nPLC c\u0169ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n an to\u00e0n \u0111\u1ec3 b\u1ea3o v\u1ec7 nh\u00e2n vi\u00ean v\u00e0 thi\u1ebft b\u1ecb kh\u1ecfi nguy hi\u1ec3m. V\u1edbi t\u00ednh n\u0103ng gi\u00e1m s\u00e1t li\u00ean t\u1ee5c v\u00e0 kh\u1ea3 n\u0103ng ph\u1ea3n \u1ee9ng nhanh, PLC c\u00f3 th\u1ec3 ng\u1eaft k\u1ebft n\u1ed1i \u0111i\u1ec7n cho c\u00e1c thi\u1ebft b\u1ecb nguy hi\u1ec3m khi ph\u00e1t hi\u1ec7n c\u00e1c t\u00ecnh hu\u1ed1ng kh\u00f4ng an to\u00e0n. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m nguy c\u01a1 tai n\u1ea1n lao \u0111\u1ed9ng v\u00e0 b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng l\u00e0m vi\u1ec7c.<\/p>\n
<\/span>4. S\u1ef1 kh\u00e1c nhau gi\u1eefa PLC v\u00e0 c\u00e1c lo\u1ea1i \u0111i\u1ec1u khi\u1ec3n kh\u00e1c<\/span><\/h2>\n![\"4.](\"https:\/\/ungdung.hotronghiencuu.com\/open\/wp-content\/uploads\/2023\/09\/plc_thiet_bi_dieu_khien_logic_co_kha_nang_lap_trinh_cau_tao_va_hoat_dong_nhu_the_nao.jpg\" "\\"4.")
<\/p>\n
<\/span>4.1 S\u1ef1 kh\u00e1c nhau v\u1ec1 c\u1ea5u tr\u00fac<\/span><\/h3>\nPLC \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf d\u1ef1a tr\u00ean m\u1ed9t vi x\u1eed l\u00fd ch\u00ednh v\u00e0 c\u00e1c m\u1ea1ch \u0111i\u1ec7n t\u1eed \u0111\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh logic. Trong khi \u0111\u00f3, c\u00e1c lo\u1ea1i \u0111i\u1ec1u khi\u1ec3n kh\u00e1c nh\u01b0 b\u1ed9 \u0111i\u1ec1u khi\u1ec3n t\u1ea7n s\u1ed1 hay b\u1ed9 \u0111i\u1ec1u khi\u1ec3n logic kh\u00f4ng s\u1eed d\u1ee5ng c\u1ea5u tr\u00fac t\u01b0\u01a1ng t\u1ef1.<\/p>\n
<\/span>4.2 S\u1ef1 kh\u00e1c nhau v\u1ec1 \u1ee9ng d\u1ee5ng<\/span><\/h3>\nPLC th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00f4ng nghi\u1ec7p, trong khi c\u00e1c lo\u1ea1i \u0111i\u1ec1u khi\u1ec3n kh\u00e1c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau nh\u01b0 \u0111i\u1ec1u khi\u1ec3n m\u00e1y m\u00f3c, h\u1ec7 th\u1ed1ng n\u0103ng l\u01b0\u1ee3ng v\u00e0 h\u1ec7 th\u1ed1ng x\u1eed l\u00fd n\u01b0\u1edbc.<\/p>\n
<\/span>5. \u01afu \u0111i\u1ec3m v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a PLC<\/span><\/h2>\n<\/span>5.1 \u01afu \u0111i\u1ec3m c\u1ee7a PLC<\/span><\/h3>\n– Kh\u1ea3 n\u0103ng x\u1eed l\u00fd t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o v\u00e0 ra r\u1ea5t cao.
\n– D\u1ec5 d\u00e0ng l\u1eadp tr\u00ecnh v\u00e0 c\u00e0i \u0111\u1eb7t.
\n– C\u00f3 t\u00ednh linh ho\u1ea1t cao cho vi\u1ec7c m\u1edf r\u1ed9ng v\u00e0 ch\u1ec9nh s\u1eeda ch\u01b0\u01a1ng tr\u00ecnh.
\n– \u0110\u00e1ng tin c\u1eady v\u00e0 \u1ed5n \u0111\u1ecbnh trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng.<\/p>\n
<\/span>5.2 Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a PLC<\/span><\/h3>\n– Chi ph\u00ed ban \u0111\u1ea7u cao h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i \u0111i\u1ec1u khi\u1ec3n kh\u00e1c.
\n– Y\u00eau c\u1ea7u ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n \u0111\u1ec3 l\u1eadp tr\u00ecnh v\u00e0 v\u1eadn h\u00e0nh.
\n– Kh\u00f4ng th\u1ec3 x\u1eed l\u00fd c\u00e1c t\u00e1c v\u1ee5 ph\u1ee9c t\u1ea1p nh\u01b0 m\u00e1y t\u00ednh th\u00f4ng th\u01b0\u1eddng.<\/p>\n
<\/span>6. Vai tr\u00f2 c\u1ee7a PLC trong h\u1ec7 th\u1ed1ng t\u1ef1 \u0111\u1ed9ng h\u00f3a<\/span><\/h2>\n![\"6.](\"https:\/\/ungdung.hotronghiencuu.com\/open\/wp-content\/uploads\/2023\/09\/plc_thiet_bi_dieu_khien_logic_co_kha_nang_lap_trinh_cau_tao_va_hoat_dong_nhu_the_nao.jpeg\" "\\"6.")
\nPLC \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c t\u1ef1 \u0111\u1ed9ng h\u00f3a c\u00e1c quy tr\u00ecnh c\u00f4ng nghi\u1ec7p. V\u1edbi kh\u1ea3 n\u0103ng k\u1ebft n\u1ed1i v\u00e0 \u0111i\u1ec1u khi\u1ec3n c\u00e1c thi\u1ebft b\u1ecb, PLC gi\u00fap t\u0103ng hi\u1ec7u su\u1ea5t s\u1ea3n xu\u1ea5t, gi\u1ea3m nguy c\u01a1 sai s\u00f3t do con ng\u01b0\u1eddi v\u00e0 t\u1ea1o ra m\u00f4i tr\u01b0\u1eddng l\u00e0m vi\u1ec7c an to\u00e0n h\u01a1n. Ngo\u00e0i ra, PLC c\u0169ng cho ph\u00e9p thu th\u1eadp d\u1eef li\u1ec7u t\u1eeb c\u00e1c thi\u1ebft b\u1ecb v\u00e0 cung c\u1ea5p th\u00f4ng tin quan tr\u1ecdng \u0111\u1ec3 qu\u1ea3n l\u00fd v\u00e0 t\u1ed1i \u01b0u ho\u00e1 quy tr\u00ecnh s\u1ea3n xu\u1ea5t.<\/p>\n
<\/span>7. C\u00e1ch th\u1ee9c \u0111i\u1ec1u khi\u1ec3n ch\u00ednh c\u1ee7a PLC<\/span><\/h2>\nC\u00e1ch th\u1ee9c \u0111i\u1ec1u khi\u1ec3n ch\u00ednh c\u1ee7a PLC d\u1ef1a v\u00e0o vi\u1ec7c l\u1eadp tr\u00ecnh c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh logic. Ng\u01b0\u1eddi s\u1eed d\u1ee5ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh nh\u01b0 ladder diagram, function block diagram ho\u1eb7c structured text \u0111\u1ec3 t\u1ea1o ra c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh \u0111i\u1ec1u khi\u1ec3n. C\u00e1c ch\u01b0\u01a1ng tr\u00ecnh n\u00e0y s\u1ebd x\u1eed l\u00fd c\u00e1c t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o v\u00e0 ra t\u1eeb c\u00e1c thi\u1ebft b\u1ecb v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1edf\/\u0111\u00f3ng van, \u0111i\u1ec1u khi\u1ec3n motor hay ghi d\u1eef li\u1ec7u. PLC c\u0169ng c\u00f3 kh\u1ea3 n\u0103ng gi\u00e1m s\u00e1t li\u00ean t\u1ee5c qu\u00e1 tr\u00ecnh \u0111i\u1ec1u khi\u1ec3n v\u00e0 ph\u1ea3n \u1ee9ng theo c\u00e1c \u0111i\u1ec1u ki\u1ec7n \u0111\u01b0\u1ee3c l\u1eadp tr\u00ecnh.<\/p>\n
PLC, vi\u1ebft t\u1eaft c\u1ee7a “Programmable Logic Controller”, l\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n t\u1ef1 \u0111\u1ed9ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00f4ng nghi\u1ec7p. N\u00f3 cho ph\u00e9p l\u1eadp tr\u00ecnh v\u00e0 gi\u00e1m s\u00e1t c\u00e1c quy tr\u00ecnh s\u1ea3n xu\u1ea5t, t\u0103ng hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ea3m b\u1ea3o an to\u00e0n. PLC \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c t\u1ef1 \u0111\u1ed9ng h\u00f3a v\u00e0 ph\u00e1t tri\u1ec3n c\u00f4ng ngh\u1ec7 4.0.
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