A02B 0281 0517模块

厦门航拓电气有限公司现货销售 0592-5072116 Q Q：565167042
 
由于PLC以微处理器为核心，故具有微机的许多特点，但它的工作方式却与微机有很大不同。微机一般采用等待命令的工作方式，如常见的键盘扫描方式或I/O扫描方，若有键按下或有I/O变化，则转入相应的子程序，若无则继续扫描等待。
PLC则是采用循环扫描的工作方式。对每个程序，CPU从条指令开始执行，按指令步序号做周期性的程序循环扫描，如果无跳转指令，则从条指令开始逐条执行用户程序，直至遇到结束符后又返回条指令，如此周而复始不断循环，每一个循环称为一个扫描周期。扫描周期的长短主要取决于以下几个因素：一是CPU执行指令的速度；二是执行每条指令占用的时间；三是程序中指令条数的多少。一个扫描周期主要可分为3个阶段。
1．输入刷新阶段
在输入刷新阶段，CPU扫描全部输入端口，读取其状态并写入输入状态寄存器。完成输入端刷新工作后，将关闭输入端口，转入程序执行阶段。在程序执行期间即使输入端状态发生变化，输入状态寄存器的内容也不会改变，而这些变化必须等到下一工作周期的输入刷新阶段才能被读入。
2．程序执行阶段
在程序执行阶段，根据用户输入的控制程序，从条开始逐步执行，并将相应的逻辑运算结果存入对应的内部辅助寄存器和输出状态寄存器。当后一条控制程序执行完毕后，即转入输入（出？）刷新阶段。
3．输出刷新阶段
当所有指令执行完毕后，将输出状态寄存器中的内容，依次送到输出锁存电路（输出映像寄存器），并通过一定输出方式输出，驱动外部相应执行元件工作，这才形成PLC的实际输出。

     440RP23071      Guardmaster MSR22LM Safety Relay
440R-P23073      440RP23073      Guardmaster MSR23M Safety Relay
440R-P4NANS      440RP4NANS      Guardmaster MSR45E Extension Module
440R-S07139      440RS07139      Guardmaster CU2 Safety Relay
440R-S07140      440RS07140      Guardmaster CU2 Control Unit Relay
440R-S07279      440RS07279      Guardmaster CU2 Control Unit Relay
440R-S07280      440RS07280      Guardmaster CU2 Control Unit Relay
440R-S07281      440RS07281      Guardmaster CU2 Control Unit Relay
440R-S07283      440RS07283      Guardmaster CU2 Control Unit Relay
440R-S07284      440RS07284      Guardmaster CU2 Control Unit Relay
440R-S12R2      440RS12R2      Guardmaster Single Input Safety Relay
440R-S13R2      440RS13R2      Guardmaster Single Input Safety Relay
440R-S23173      440RS23173      Guardmaster CU4 Safety Relay
440R-S23174      440RS23174      Guardmaster CU4 Safety Relay
440R-S23175      440RS23175      Guardmaster CU4 Safety Relay
440R-S35001      440RS35001      Guardmaster CU3 Safety Relay
440R-S35002      440RS35002      Guardmaster CU3 Safety Relay
440R-S35003      440RS35003      Guardmaster CU3 Safety Relay
440R-S845AER-NNL      440RS845AERNNL      MSR57P Speed Monitoring Safety Relay
440R-T07114      440RT07114      Guardmaster CU1 Safety Relay
440R-W23217      440RW23217      Guardmaster MSR329P Safety Relay
440R-W23218      440RW23218      Guardmaster MSR320P Safety Relay
440R-W23219      440RW23219      Guardmaster MSR310P Safety Relay
440R-W23220      440RW23220      Guardmaster MSR312P Safety Relay
440R-W23221      440RW23221      Guardmaster MSR330P Group1 Safety Relay
440R-W23222      440RW23222      Guardmaster MSR330P Group 2 Safety Relay
440R-W23223      440RW23223      Guardmaster MSR330P Group3 Safety Relay
440R-W23224      440RW23224      MSR338P Time Delay Expansion Module
440R-W23225      440RW23225      MSR338P Time Delay Expansion Module
440R-W23226      440RW23226      MSR338P Time Delay Expansion Module
440R-ZBE820AZ1      440RZBE820AZ1      Guardmaster MSR19E Safety Relay
440R-ZBE820AZ2      440RZBE820AZ2      Guardmaster MSR19E Safety Relay
440R-ZBL220Z24      440RZBL220Z24      Guardmaster MSR17T Safety Relay
440R-ZBR520AZ1      440RZBR520AZ1      Guardmaster MSR18T Safety Relay
440R-ZBR520AZ2      440RZBR520AZ2      Guardmaster MSR18T Safety Relay
440S-M470300      440SM470300      SIGMA NON CONTACT SWITCHES
440S-M470303      440SM470303      SIGMA NON CONTACT SWITCHES
440S-M471161      440SM471161      SIGMA NON CONTACT SWITCHES
440S-M545002      440SM545002      SIGMA NON CONTACT SWITCHES
440S-M545005      440SM545005      SIGMA NON CONTACT SWITCHES
440S-M545008      440SM545008      SIGMA NON CONTACT SWITCHES
440S-M545009      440SM545009      SIGMA NON CONTACT SWITCHES
440S-M545013      440SM545013      SIGMA NON CONTACT SWITCHES
440S-M545038      440SM545038      SIGMA NON CONTACT SWITCHES
440S-M545039      440SM545039      SIGMA NON CONTACT SWITCHES
440S-M545040      440SM545040      SIGMA NON CONTACT SWITCHES
440S-M545098      440SM545098      SIGMA NON CONTACT SWITCHES
440S-M565052      440SM565052      SIGMA NON CONTACT SWITCHES

1C31166G01   1C31166G01
1C31179G02   1C31179G02
1C31181G02   1C31181G02
1C31189G01   1C31189G01
1C31192G01   1C31192G01
1C31197G01   1C31197G05   1C31197G01
1C31219G01   1C31219G01
1C31224G01     1C31224G01
1C31224G01   1C31224G01
1C31238H01   1C31238H01
1P00028G01   1P00028G01
1TGE120010R1000
200-CICN
2094-AC09-M02   2094-AC09-M02
2094-AM02-S 2094AM02-S
2094-BMP5-S   2094-BMP5-S
2098-DSD-010X   2098-DSD-010X
2098-DSD-010X-DN   2098-DSD-010X-DN
2150-AGA 1747-KE
269PLUS-100P-120
2706-M1N1
2711-B5A10   2711-B5A10
2711P-T10C4D2
2711-T10C8X   2711-T10C8X
2711-T9C1X   2711-T9C1X
3300/03   3300/03-01-00
3300/16   3300/16-15-01-03-00-00-00
3300/20   3300/20-13-03-01-00-00
3300/20 3300/20-12-02-00-00-00
3300/20-05-03-01-00-00
3300/46   3300/46-46-04-02-01
3300/47 3300/47-XX-XX-01-00
3300/65   3300/65-14-01-00-00-01-00
330100-50-00，带包装330100-50-00。价格超好
330101-00-16-10-02-00
330101-00-30-10-02-00
330101-00-50-10-02-00
330103-00-04-10-02-CN
330103-00-05-05-02-00
330103-00-05-10-02-00
330103-00-06-10-02-00
330103-00-10-10-02-00
330103-00-14-10-01-00
330104-00-06-10-11-00
330104-00-11-10-02-05
330104-00-12-10-02-00
330105-02-12-10-02-00
330105-02-12-20-02-05
330106-05-30-05-02-05
330106-05-30-10-02-00
330106-05-30-10-02-CN
330130-045-00-05
330130-080-00-00
330130-085-00-00
330180-50-00
330180-50-05
330180-51-05
330180-90-00 330180-90-05
330180-91-00 330780-91-00
330709-000-070-10-02-00
330730-040-00-00
330780-50-00
330780-51-00
330780-90-00330780-90-00
330850-50-05
330851-04-000-023-10-01-05
330910-05-10-02-00
330930-065-02-00
330980-50-00   330980-50-00
440S-M565055      440SM565055      S