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传统的继电器控制系统使用了大量的中间继电器、时间继电器，由于触点接触不良，容易出现故障。PLC用软件代替大量的中间继电器和时间继电器，仅剩下与输入和输出有关的少量硬件元件，接线可减少到继电器控制系统的1/10-1/100，因触点接触不良造成的故障大为减少。主电路是给异步电动机提供调压调频电源的电力变换部分，变频器的主电路大体上可分为两类：电压型是将电压源的直流变换为交流的变频器，直流回路的滤波是电容。郑工1995 9281761

YOKOGAWA 251-340-LSLS     251340LSLS
YOKOGAWA 251-340-LSLS   251340LSLS
YOKOGAWA 251340LSMT     251340LSMT
YOKOGAWA 251340LSND PANEL METER RANGE: 0-15 AC AMPERES,      *
YOKOGAWA 251-340-LSNG     251340LSNG
YOKOGAWA 251-340-LSNW 0-60 AMP GAUGE       IN BOX
YOKOGAWA 251-340-LSNW   251340LSNW
YOKOGAWA 251-340-LSPB     251340LSPB
YOKOGAWA 251-340-LSPD     251340LSPD
Yokogawa 251340LSPK 0-100AC Panel Mount Amp Meter
YOKOGAWA 251-340-LSPK     251340LSPK
YOKOGAWA 251-340-LSPK     251340LSPK
YOKOGAWA 251-340-LSPZ7AAK   251340LSPZ7AAK
Yokogawa 251340LSRL A-C Amperes Meter Panel Mount
Yokogawa 251340LSSC 0-400 A-C Amperes Panel Mount Meter
Yokogawa 251340LSSJ Panel Meter 0-600 AC Amps
Yokogawa 251340LSSJ Panel Meter 0-600 AC Amps
Yokogawa 251340LSV Meter Gauge 0-5 Amp *      in Box**
Yokogawa 251340NT-NT7 0-50 AC Ampere Panel Meter, NIB
YOKOGAWA 251340PDPD7 *      IN BOX*
YOKOGAWA 251-340-XXXX     251340XXXX
YOKOGAWA 251344NEN17 AC VOLTS 0-30 *      IN A BOX*
YOKOGAWA 251344NLN17 0-30 A-C VOLTS PANEL METER *      IN A BOX*
YOKOGAWA 251344PDPD7JHK/UL 0-85 VAC *      IN A BOX*
YOKOGAWA 251-344-PZPZ   251344PZPZ
YOKOGAWA 251344RXRX       YE/251-3 AC VOLTS PANEL METER 251344RXRX
YOKOGAWA 251-344-SJSJ METER *      IN A BOX*
YOKOGAWA 251400FAFA7JJK    251400FAFA7JJK
YOKOGAWA 251400FAFA8JJK    251400FAFA8JJK
Yokogawa 251400HEXX Panel Meter
YOKOGAWA 251-400-LSLS-4UL     251400LSLS4UL