{"id":13482,"date":"2021-11-17T14:03:32","date_gmt":"2021-11-17T07:03:32","guid":{"rendered":"https:\/\/dattech.com.vn\/dat-cung-cap-da-dang-danh-muc-module-mo-rong-tin-hieu-cho-plc\/"},"modified":"2022-05-26T08:52:01","modified_gmt":"2022-05-26T01:52:01","slug":"dat-provides-a-wide-range-of-signal-expansion-modules-for-plc","status":"publish","type":"post","link":"https:\/\/dattech.com.vn\/en\/dat-provides-a-wide-range-of-signal-expansion-modules-for-plc\/","title":{"rendered":"DAT provides a wide range of Signal Expansion Modules for PLC"},"content":{"rendered":"

Trong c\u00e1c d\u1ef1 \u00e1n l\u1edbn, s\u1ed1 l\u01b0\u1ee3ng c\u00e1c \u0111\u1ea7u v\u00e0o\/ra d\u1ea1ng s\u1ed1 (digital) ho\u1eb7c d\u1ea1ng t\u01b0\u01a1ng t\u1ef1 (analog) c\u00f3 s\u1eb5n c\u1ee7a PLC th\u01b0\u1eddng s\u1ebd kh\u00f4ng \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c to\u00e0n b\u1ed9 nhu c\u1ea7u. Khi \u0111\u00f3, ng\u01b0\u1eddi d\u00f9ng c\u1ea7n s\u1eed d\u1ee5ng th\u00eam c\u00e1c module t\u00edn hi\u1ec7u m\u1edf r\u1ed9ng. Xu\u1ea5t ph\u00e1t t\u1eeb nhu c\u1ea7u n\u00e0y, \u0111\u1ed3ng th\u1eddi mong mu\u1ed1n mang \u0111\u1ebfn nh\u1eefng gi\u1ea3i ph\u00e1p chuy\u00ean bi\u1ec7t gi\u00fap t\u1ed1i \u01b0u hi\u1ec7u qu\u1ea3 cho t\u1eebng kh\u00e1ch h\u00e0ng, DAT \u0111\u00e3 gia t\u0103ng n\u0103ng l\u1ef1c cung \u1ee9ng v\u1edbi \u0111a d\u1ea1ng danh m\u1ee5c module m\u1edf r\u1ed9ng t\u00edn hi\u1ec7u cho PLC t\u1eeb th\u01b0\u01a1ng hi\u1ec7u INVT v\u00e0 Siemens.<\/em><\/p>\n

T\u00edn hi\u1ec7u s\u1ed1 (digital) l\u00e0 g\u00ec?<\/strong><\/p>\n

T\u00edn hi\u1ec7u s\u1ed1 (digital) l\u00e0 t\u00edn hi\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 bi\u1ec3u di\u1ec5n m\u1ed9t chu\u1ed7i gi\u00e1 tr\u1ecb r\u1eddi r\u1ea1c kh\u00f4ng li\u00ean t\u1ee5c, ch\u1ec9 bao g\u1ed3m hai m\u1ee9c cao v\u00e0 th\u1ea5p (trong m\u00e1y t\u00ednh l\u00e0 0 v\u00e0 1). Trong IC TTL (vi m\u1ea1ch s\u1ed1 h\u1ecd TTL), khi s\u1eed d\u1ee5ng ngu\u1ed3n cung c\u1ea5p +5V ti\u00eau chu\u1ea9n, b\u1ea5t k\u1ef3 \u0111\u1ea7u v\u00e0o \u0111i\u1ec7n \u00e1p TTL n\u00e0o trong kho\u1ea3ng t\u1eeb 2V \u0111\u1ebfn 5V \u0111\u01b0\u1ee3c xem l\u00e0 logic \u201c1\u201d ho\u1eb7c \u201cHIGH\u201d. Trong khi \u0111\u00f3, b\u1ea5t k\u1ef3 \u0111\u1ea7u v\u00e0o \u0111i\u1ec7n \u00e1p n\u00e0o d\u01b0\u1edbi 0.8V \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn l\u00e0 logic \u201c0\u201d ho\u1eb7c \u201cLOW\u201d.\u00a0V\u00f9ng \u0111i\u1ec7n \u00e1p \u1edf gi\u1eefa hai m\u1ee9c \u0111i\u1ec7n \u00e1p n\u00e0y l\u00e0\u00a0v\u00f9ng kh\u00f4ng x\u00e1c \u0111\u1ecbnh. Ho\u1ea1t \u0111\u1ed9ng trong v\u00f9ng n\u00e0y c\u00f3 th\u1ec3 khi\u1ebfn c\u1ed5ng logic t\u1ea1o ra \u0111\u1ea7u ra sai.<\/p>\n

\"dat-cung-cap-da-dang-danh-muc-module-mo-rong-tin-hieu-cho-plc-h11711\"
T\u00edn hi\u1ec7u s\u1ed1<\/figcaption><\/figure>\n

\u0110\u1ec3 hi\u1ec3u c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a t\u00edn hi\u1ec7u s\u1ed1, h\u00e3y tham kh\u1ea3o v\u00ed d\u1ee5 sau \u0111\u00e2y:<\/p>\n

T\u00edn hi\u1ec7u s\u1ed1 l\u00e0 nh\u1eefng t\u00edn hi\u1ec7u \u201cC\u1ea3m bi\u1ebfn m\u1ef1c n\u01b0\u1edbc h\u1ed3\u201d g\u1ed3m c\u1ea3m bi\u1ebfn \u201cMin\u201d, c\u1ea3m bi\u1ebfn \u201cMax\u201d. C\u1ea3m bi\u1ebfn n\u00e0y s\u1ebd tr\u1ea3 v\u1ec1 PLC<\/a> t\u00edn hi\u1ec7u ON\/OFF (0 ho\u1eb7c 1). V\u1edbi c\u1ea3m bi\u1ebfn Min v\u00e0 Max c\u00f9ng t\u00e1c \u0111\u1ed9ng m\u1ee9c ON, PLC s\u1ebd hi\u1ec3u l\u00e0 n\u01b0\u1edbc trong h\u1ed3 \u0111ang \u0111\u1ea7y. V\u1edbi c\u1ea3m bi\u1ebfn Min v\u00e0 Max c\u00f9ng t\u00e1c \u0111\u1ed9ng m\u1ee9c OFF, PLC s\u1ebd hi\u1ec3u l\u00e0 trong h\u1ed3 h\u1ebft n\u01b0\u1edbc. Nh\u01b0 v\u1eady, khi trong h\u1ed3 c\u1ea1n n\u01b0\u1edbc t\u1edbi m\u1ee9c MIN th\u00ec b\u01a1m s\u1ebd ho\u1ea1t \u0111\u1ed9ng, ng\u01b0\u1ee3c l\u1ea1i n\u01b0\u1edbc d\u00e2ng t\u1edbi m\u1ee9c MAX th\u00ec b\u01a1m s\u1ebd d\u1eebng.<\/p>\n

T\u01b0\u01a1ng \u1ee9ng v\u1edbi \u0111\u1ed9ng c\u01a1, ON l\u00e0 \u0111\u1ed9ng c\u01a1 ch\u1ea1y, OFF l\u00e0 \u0111\u1ed9ng c\u01a1 ng\u1eebng. \u0110\u00e2y c\u0169ng ch\u00ednh l\u00e0 t\u00edn hi\u1ec7u 0 ho\u1eb7c 1 trong h\u1ec7 nh\u1ecb ph\u00e2n m\u00e0 PLC c\u00f3 th\u1ec3 x\u1eed l\u00fd \u0111\u01b0\u1ee3c.<\/p>\n

\"dat-cung-cap-da-dang-danh-muc-module-mo-rong-tin-hieu-cho-plc-h21711\"
Minh h\u1ecda v\u1ec1 t\u00edn hi\u1ec7u s\u1ed1 trong th\u1ef1c t\u1ebf<\/figcaption><\/figure>\n

T\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 (analog) l\u00e0 g\u00ec?<\/strong><\/p>\n

T\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 (analog) l\u00e0 m\u1ed9t t\u00edn hi\u1ec7u li\u00ean t\u1ee5c v\u00e0 l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng thay \u0111\u1ed5i theo th\u1eddi gian. T\u00edn hi\u1ec7u n\u00e0y \u0111\u01b0\u1ee3c c\u1ea3m bi\u1ebfn \u0111o t\u1eeb c\u00e1c y\u1ebfu t\u1ed1 t\u1ef1 nhi\u00ean xung quanh nh\u01b0 nhi\u1ec7t \u0111\u1ed9, \u00e1p su\u1ea5t ho\u1eb7c l\u01b0u l\u01b0\u1ee3ng d\u00f2ng ch\u1ea3y\u2026 H\u1ea7u h\u1ebft c\u00e1c b\u1ed9 truy\u1ec1n \u0111\u1ed9ng hi\u1ec7n nay \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n theo t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1. S\u1edf d\u0129 g\u1ecdi l\u00e0 t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 v\u00ec t\u00edn hi\u1ec7u l\u00fac sau c\u00f3 d\u1ea1ng t\u01b0\u01a1ng t\u1ef1 nh\u01b0 t\u00edn hi\u1ec7u l\u00fac tr\u01b0\u1edbc. \u1ede \u0111\u00e2y c\u1ea7n ph\u1ea3i hi\u1ec3u\u00a0t\u01b0\u01a1ng t\u1ef1\u00a0kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 gi\u1ed1ng nhau m\u00e0 ch\u00fang ch\u1ec9 t\u01b0\u01a1ng t\u1ef1 v\u1ec1 b\u1ea3n ch\u1ea5t t\u00edn hi\u1ec7u, c\u00f2n c\u01b0\u1eddng \u0111\u1ed9 s\u1ebd kh\u00e1c nhau. Trong thi\u1ebft b\u1ecb \u0111i\u1ec7n, t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 l\u00e0 d\u00f2ng \u0111i\u1ec7n. Trong cu\u1ed9c s\u1ed1ng, t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 c\u00f3 th\u1ec3 l\u00e0 nhi\u1ec7t \u0111\u1ed9, \u00e1p su\u1ea5t, l\u01b0u l\u01b0\u1ee3ng\u2026<\/p>\n

Sau \u0111\u00e2y s\u1ebd l\u00e0 m\u1ed9t v\u00ed d\u1ee5 v\u1ec1 t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1:<\/p>\n

Ch\u00fang ta th\u1ef1c hi\u1ec7n m\u1ed9t ph\u00e9p \u0111o \u00e1p su\u1ea5t trong \u0111\u01b0\u1eddng \u1ed1ng ph\u1ea1m vi t\u1eeb 0 – 100psi. C\u1ea3m bi\u1ebfn \u00e1p su\u1ea5t s\u1ebd th\u1ef1c hi\u1ec7n ph\u00e9p \u0111o v\u00e0 chuy\u1ec3n n\u00f3 v\u1ec1 t\u00edn hi\u1ec7u \u0111i\u1ec7n 0 – 3mV (t\u00f9y v\u00e0o \u0111\u1eb7c t\u00ednh c\u1ee7a m\u1ed7i lo\u1ea1i c\u1ea3m bi\u1ebfn m\u00e0 s\u1ebd \u0111\u01b0a v\u1ec1 nh\u1eefng t\u00edn hi\u1ec7u \u0111i\u1ec7n kh\u00e1c nhau). Nh\u01b0ng v\u1edbi c\u00e1c t\u00edn hi\u1ec7u n\u00e0y, PLC ch\u01b0a hi\u1ec3u \u0111\u01b0\u1ee3c. V\u00ec v\u1eady, ch\u00fang ta c\u1ea7n ph\u1ea3i \u0111\u01b0a t\u00edn hi\u1ec7u v\u1ec1 chu\u1ea9n 1 –\u00a0 5V th\u00f4ng qua m\u1ed9t thi\u1ebft b\u1ecb g\u1ecdi l\u00e0 b\u1ed9 khuy\u1ebfch \u0111\u1ea1i t\u00edn hi\u1ec7u hay b\u1ed9 transmitter (trong th\u1ef1c t\u1ebf, b\u1ed9 transmitter n\u00e0y c\u00f3 th\u1ec3 l\u00e0 c\u00e1c module r\u1eddi r\u1ea1c, ho\u1eb7c \u0111i chung v\u1edbi c\u1ea3m bi\u1ebfn). Nh\u01b0 v\u1eady, ch\u00fang ta \u0111\u00e3 th\u1ef1c hi\u1ec7n chuy\u1ec3n t\u00edn hi\u1ec7u 0 \u2013 100psi v\u1ec1 t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 1 – 5V.<\/p>\n

\"dat-cung-cap-da-dang-danh-muc-module-mo-rong-tin-hieu-cho-plc-h31711\"
Minh h\u1ecda v\u1ec1 t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 trong th\u1ef1c t\u1ebf<\/figcaption><\/figure>\n

Chuy\u1ec3n \u0111\u1ed5i \u0111\u1ebfn \u0111\u00e2y th\u00ec PLC v\u1eabn ch\u01b0a hi\u1ec3u \u0111\u01b0\u1ee3c v\u00ec CPU ch\u1ec9 x\u1eed l\u00fd \u0111\u01b0\u1ee3c c\u00e1c t\u00edn hi\u1ec7u s\u1ed1 nh\u1ecb ph\u00e2n, r\u1eddi r\u1ea1c. \u0110\u00e2y l\u00e0 l\u00fd do c\u1ea7n ph\u1ea3i chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 sang t\u00edn hi\u1ec7u s\u1ed1. \u0110\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c \u0111i\u1ec1u n\u00e0y, ta c\u1ea7n s\u1eed d\u1ee5ng b\u1ed9 (Analog to Digital Converter) \u0111\u1ec3 chia t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 th\u00e0nh nhi\u1ec1u ph\u1ea7n nh\u1ecf (g\u1ecdi l\u00e0 l\u1ea5y m\u1eabu). Sau \u0111\u00f3, d\u00f9ng nhi\u1ec1u s\u1ed1 0 v\u00e0 1 \u0111\u1ea1i di\u1ec7n cho t\u1eebng ph\u1ea7n nh\u1ecf \u0111\u00f3 \u0111\u01b0a CPU x\u1eed l\u00fd. \u0110\u1ed3ng th\u1eddi \u0111\u1ec3 xu\u1ea5t c\u00e1c t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 ra b\u00ean ngo\u00e0i m\u00f4i tr\u01b0\u1eddng, ch\u00fang ta s\u1eed d\u1ee5ng b\u1ed9 DAC (Digital to Analog Converter) chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u s\u1ed1 th\u00e0nh t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1. Trong th\u1ef1c t\u1ebf, c\u00e1c b\u1ed9 ADC v\u00e0 DAC \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p v\u00e0o trong PLC ho\u1eb7c c\u00e1c module m\u1edf r\u1ed9ng analog.<\/p>\n

\"dat-cung-cap-da-dang-danh-muc-module-mo-rong-tin-hieu-cho-plc-h41711\"
B\u1ed9 ADC v\u00e0 DAC<\/figcaption><\/figure>\n

M\u1ed9t s\u1ed1 chu\u1ea9n t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u1ef1 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00f4ng nghi\u1ec7p hi\u1ec7n nay:<\/p>\n