Description
现场总线是90年代初发展起来的,远程I/O应该采用现场总线,如CAN、LONWORKS、HART总线。在DCS系统中,远程I/O采用HART总线比较多。比如现场的变送器,距离控制器机柜比较远,常把16个变送器来的信号编成一组,用HART总线把信号送到控制器,控制器同时读进16个变送器来的信号。采用现场总线,控制器和变送器两者距离可达1公里以上。
ALLEN BRADLEY 1391B-AA15 SER. D AC SERVO
PACIFIC SCIENTIFIC SA60300101 REMAN SA603-001-01
ROOTS ROTARY LOBE BLOWER 42 U-RAI NEW 42URAI
CLEVELAND BRUSHLESS DC SERVO MOTOR BLM4046-TOOT-122F
ALLEN BRADLEY AC SERVO MOTOR 1326AB-A3E-11-K4 NIB
ABB E31978 PURGING CONTROL BOARD E-31978
ABB E32767 PURGING CONTROL BOARD E-32767
ABB 3HAC36191 BOARD 3HAC3619-1
SIEMENS 6SN1111-0AA00-0CB0 REACTOR 6SN11110AA000CB0
SPELLMAN HIGH VOLTAGE DC SUPPLY RHR30P60/C