三、硬件方法
1. 优化输入点数
在某些应用场合下有“自动控制/手动控制”的要求,并且在运行过程中,自动和手动不会同时进行,这样就可以将自动和手动按照不同的控制状态分组接入PLC输入端,可减少输入点,提高输入点的利用率,图6中的示例节省了50%的I点,相当于输入点数扩充了一倍。
其中SA为手动/自动切换开关,SBl,SB2,SB3为一组输入,SBl0,SB20,SB30为一组输入。
在某些联锁情况下,如果PLC内部不采集该触点信号的状态,可采用物理联锁的方式进行,即硬件连接上进行联锁(不必每一个开关量都接到PLC的输入端),也可在一定程度上减少输入点数。
2. 优化输出点数
除了优化输入点数外还可优化输出点数,对系统整个运行过程中,输出状态完全一样的执行元件可以采用并联的方式,但要注意负载的功率情况,通常情况下采用继电器加续流二极管。此外还可以采用三八线译码器等方法,但需采用外部元器件,操作略微复杂一些。
四、结论
上述的几种方法虽然比较简单,但切实可行并且容易掌握,在不同的PLC中实现的途径略微不同,但基本思路都是一致的,通过对系统的优化可以进一步提高I/O的利用率,节省输入和输出点的数量,减少PLC的体积,降低硬件成本,具有很高的实用价值。
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MVME 130DOF
MVME 130DOF 1 MODEL:CACHE-1
MVME 131
MVME 131 2 VME Board
MVME 147
MVME 147 2 Single Board Computer
MVME 147-011 :1
MVME 147-012
MVME 147-012 1 68030 CPU25Mhz8MB memory
MVME 147-013
MVME 147-013 7 68030 CPU, 25Mhz, 16MB memory
MVME 147-023
MVME 147-023 :70
MVME 147-023 6 PROCESSOR BOARD
MVME 147SA-1
MVME 147SA-1 4 68030 CPU, 25MHZ, 8MB, SCSI
MVME 147SA-2
MVME 147SA-2 2 32MHz SBC
MVME 147SB-1
MVME 147SB-1 3 PROCESSOR BOARD
MVME 162-031
MVME 162-031 1 Board
MVME 162-12
MVME 162-12 1 Board
MVME 162-210
MVME 162-210 2 Board
MVME 162-263 :4
MVME 162-522A
MVME 162-523
MVME 162P244LE
MVME 162P244LE 2 68040 CPU, 25Mhz, 16MB, 2 SIO, 4 DMA IP, Ethernet
MVME 162P344SE
MVME 162P344SE 2 Board
MVME 167
MVME 167 4 VME CPU BOARD 68040/25HZ W/16MB RAM
MVME 167-02A
MVME 167-02A 2 CONTROL BOARD
MVME 167-02B
MVME 167-02B 2 Board
MVME 167-03B
MVME 167-03B 7 VMEbus VME Board
MVME 167-04A
MVME 167-04A 6 68040U CPU, 25Mhz, 32MB
MVME 167B
MVME 167B 1 PROCESSOR BOARD
MVME 177-004
MVME 177-004 4 68060 CPU, 50Mhz, 128KB, 32MB
MVME 177-005
MVME 177-005 4 68060 CPU, 50Mhz, 128KB, 64MB
MVME 188
MVME 188 1 16MB Memory Board
MVME 224-2
MVME 224-2 2 Board
MVME 332XT
MVME 332XT 4 68010 Intelligent Communications Controller
MVME 332XTP
MVME 332XTP 1 SINGLE BOARD
MVME 332XTS
MVME 332XTS 1 8-Channel Intelligent Serial Communications Controller Board
MVME 333-2
MVME 333-2 3 Serial Controller Card
MVME 334
MVME110-1
MVME110-1 68000 8 MHZ, 1 CHANNEL, SERIAL, RS232C 12
MVME133
MVME133 68020 CPU, 12.5Mhz, 1MB memory, 3 Serial ports 1
MVME133-1
MVME133-1 68020 CPU, 16.67Mhz, 1MB memory, 3 Serial ports 3
MVME133A-20
MVME133A-20 68020 CPU, 20Mhz, 1MB memory, 3 Serial ports 1
MVME133SA
MVME133SA 68020 CPU, 20Mhz, 1MB memory, 3 Serial ports 7
MVME141-1
MVME141-1 68030 CPU, 25Mhz, VSB A32/D32, 2 SIO 1
MVME141-3
MVME141-3 68030 CPU, 1
MVME147
MVME147 68030 CPU, 20Mhz, 4MB memory, 6
MVME147-010
MVME147-010 68030 CPU, 16Mhz, 4MB DRAM, 4 SIO, 1 PIO 5
MVME147-010A
MVME147-010A 68030 CPU, 16.67MHZ, 4MB, SCSI, ETHERNET 4
MVME147-011
MVME147-011 68030 CPU, 25Mhz, 4MB memory 15
MVME147-011A
MVME147-011A 68030 CPU, 25MHZ, 4MB, SCSI, ETHERNET 6
MVME147-012
MVME147-012 68030 CPU, 25Mhz, 8MB memory 4
MVME147-012A
MVME147-012A 68030 CPU, 25Mhz, 8MB memory 1
MVME147-013
MVME147-013 68030 CPU, 25Mhz, 16MB memory 29
MVME147-013A
MVME147-013A 68030 CPU, 25Mhz, 16MB memory 18
MVME147-022
MVME147-022 68030 CPU, 32Mhz, 8MB memory 47
MVME147-022A
MVME147-022A 68030 CPU, 33MHZ, 16MB, SCSI, ETHERNET 14
MVME147-024
MVME147-024 68030 CPU, 33MHZ, 16MB 1
MVME147S
MVME147S 68030 CPU, 20MHZ, 4MB 2
MVME147S-1
MVME147S-1 68030 CPU, 25MHZ, 4MB, SCSI, ETHERNET 43
MVME147SA-1
MVME147SA-1 68030 CPU, 25MHZ, 8MB, SCSI, 6
资讯来源:漳州鼎晟达自动化设备有限公司
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