它为优化编码性能提供了一个环境，与汇编语言相似。
厂家提供的编程软件中一般包括一种或几种编程语言，如TE公司的XTEL编程软件可以使用梯形图（Ladder）、顺序功能图（Grafcet）、结构化文本（Literal）3种编程语言；Siemens公司的Step7编程软件可以使用梯形图（Ladder）、指令表（STL）两种编程语言；Modicon公司的Modsoft编程软件只使用梯形图（984梯形）一种编程语言，而另一个Concept编程软件可以使用5种编程语言，依次为梯形图（LD）、顺序功能图（SFC）、功能块图（FBD）、结构化文本（ST）、指令表（IL）。同一编程软件下的编程语言大多数可以互换，一般选择自己比较熟悉的编程语言。
3、存储器
PLC存储器是保存程序和数据的地方，分内制式和外插式两种，存储器容量在512~128M字节之间，一定要根据实际情况选取足够大的存储器，并且要求有一部分空余作为缓存。
PLC存储器按照类型可分随机存储器（RAM）、只读存储器（ROM）、可擦除只读存储器（EPROM）等。RAM可以任意读写，在掉电后程序只能保持一段时间，适合于在自控系统调试时使用。ROM只能读不能写，程序是由厂家或开发商事先固化的，不能更改，即使失电也不丢失。EPROM与ROM只是EPROM通过特殊的方式（如紫外线）可以擦除再写，适合于应用在长时间工作而改动不大的系统中。
PLC较继电器控制的另一个优势在于它可以根据实际需要任意更改控制结构（或控制过程），这就要求更改程序方便快捷。
5、是否有专用模块
部分生产厂家的PLC产品提供一些专用模块，如通信模块、PID控制模块、计数器模块、模拟输入/输出模块等。在软件上也提供了与此相对应的程序块，往往只是简单的输入一些参数就能实现，便于用户编程。
五、与监控系统的通信
CACR-SR01AA2AH-Y3 Yaskawa Yasnac AC Servo Drive ServoPa
One-day shipping available
CACR-PR01AC4ER Yaskawa Yasnac AC Servo Drive ServoPack
One-day shipping available
CACR-SR01AC1ER Yaskawa Yasnac AC Servo Drive ServoPack
One-day shipping available
CACR-PRA5AC3ER Yaskawa Yasnac AC Servo Drive ServoPack
One-day shipping available
CACR-PRA5AC4ER Yaskawa Yasnac AC Servo Drive ServoPack
One-day shipping available
CACR-HR03BB Yaskawa Yasnac AC Servo Drive ServoPack
One-day shipping available
Yaskawa CIMR-37AS3 Juspeed Drive 230 V 3.7 kW
One-day shipping available
Yaskawa Servopack CACR-SR15SZ1SDY77 Servo Drive Rebuilt
Yaskawa Servopack CACR-SR15SZ1SDY77 Servo Drive Rebuilt
Yaskawa / Magnetek GPD506V-A080 25HP 230V AC Drive
One-day shipping available
CACR-HR01BAB12 Yaskawa Yasnac AC Servo Drive ServoPack
One-day shipping available
DR2-03BCP-F TUV Yaskawa AC Servo Drive Unit Servopack
One-day shipping available
Matsuura 7.5K Yaskawa Spindle Drive, Amplifier CNC Mill
CACR-SR20BB1BF-H YASKAWA SERVO DRIVE *1YR.WRTY*
One-day shipping available
CIMR-G5C47P5 YASKAWA VARISPEED DRIVE
One-day shipping available
YASNAK SGDM-20AD SERVO DRIVE Yaskawa
NEW YASKAWA E7 N BYPASS VARISPEED AC DRIVE
Yaskawa CIMR-37AS2 Yaskawa Juspeed Drive 230 V 3.7 kW
One-day shipping available
Yaskawa CIMR-M5A20225 VS-626M5 Inverter Spindle Drive
YASKAWA CIMR-P7U4015 VARISPEED DRIVE 34A 26KVA **RFB**
Yaskawa CIMR-P7U40151 AC Drive 25HP 460V
YASKAWA CACR-SR01AC1ERY102 SERVOPACK SERVO DRIVE *XLNT*
Yaskawa CIMR-VU4A0038FAA AC Drive 25HP 460V
SGDB-10VD Yaskawa AC ServoPack SIGMA I Servo Drive Unit
One-day shipping available
Yaskawa / Magnetek CIMR-G5M25P5 7.5HP 230V AC Drive
One-day shipping available
SGDB-10ADGY1 Yaskawa AC ServoPack SIGMA I Servo Drive
One-day shipping available
SGDB-10ADGY8 Yaskawa AC ServoPack SIGMA I Servo Drive
One-day shipping available
Yaskawa Servopack Servo Drive CACR-SR20ZISFY-1 USED
Expedited shipping available
Yaskawa / Magnetek CIMR-G5M2015 20HP 230V AC Drive
One-day shipping available
Yaskawa / Magnetek CIMR-G3U4011 15HP 460V AC Drive G3
One-day shipping available
YASKAWA SERVOPACK SGDH-75AE VER 0810E SERVO DRIVE
YASKAWA CACR-IR02SFB AC SERVO DRIVE 3 AMP ***NIB***
Yaskawa CACR-SR03AA2 Yasnac AC Servo Drive ServoPack
Yaskawa / Magnetek CIMR-G5M5018 600V 25HP AC Drive
One-day shipping available
Yaskawa ServoPack Drive 400V SGDH-1ADE IP1X SGDH1ADE
Yaskawa / Magnetek GPD506V-B034 25HP 460V AC Drive
One-day shipping available
YASKAWA SERVO DRIVE
YASKAWA SPINDLE DRIVE VARISPEED 505 MT #CDMR-MR-15K
Yaskawa Varispeed 15hp drive CIMR-PRC45P5 CIMRPR45P5
One-day shipping available
YASKAWA YASNAC Spindle Drive VS-626MTIII Top Board
Yaskawa / Magnetek CIMR-G5M4011 20HP 460V AC Drive
One-day shipping available
CIMR-08JP2-1 Yaskawa Juspoint Controller AC drive
One-day shipping available
YASKAWA CIMR-H7.5B.D06 460V 10HP AC DRIVE * TESTED
YASKAWA CACR-SR10BC1ESY262 SERVOPACK SERVO DRIVE *XLNT*
Yaskawa Servo Drive SGDB-10AN Rebuilt w/Warranty
Yaskawa / Magnetek GPD515C-A033 10HP 230V AC Drive
One-day shipping available
Yaskawa / Magnetek CIMR-G5M5022 600V 30HP AC Drive
One-day shipping available
YASKAWA CIMR-08JP3-3B00M JUSPOINT III AC DRIVE***NIB***
Yaskawa / Magnetek GPD515C-C017 600V 15HP AC Drive
One-day shipping available
SGDH-50AE Yaskawa AC ServoPack SIGMA II Servo Drive
One-day shipping available
