A06B-0857-B392

详情描述：

模拟量，如电流、电压、温度、压力等等，它的大小是连续变化的。工业生产，特别是连续型生产过程，常要对这些物理量进行控制。
作为一种工业控制电子装置，PLC若不能对这些量进行控制，那是一大不足。为此，各PLC厂家都在这方面进行大量的开发。目前，不仅大型、中型机可以进行模拟量控制，就是小型机，也能进行这样的控制。
PLC进行模拟量控制，要配置有模拟量与数字量相互转换的A／D、D／A单元。它也是I/O单元，不过是特殊的I/O单元。
A/D单元是把外电路的模拟量，转换成数字量，然后送入PLC。D/A单元，是把PLC的数字量转换成模拟量，再送给外电路。
作为一种特殊的I/O单元，它仍具有I/O电路抗干扰、内外电路隔离，与输入输出继电器（或内部继电器，它也是PLC工作内存的一个区。可读写）交换信息等等特点。
这里的A/D中的A，多为电流，或电压，也有为温度。D/A中的A，多为电压，或电流。电压、电流变化范围多为0～5V，0～10V，4～20mA。有的还可处理正负值的。
这里的D，小型机多为8位二进制数，中、大型多为12位二进制数。
A/D、D/A有单路，也有多路。多路占的输入输出继电器多。
有了A/D、D/A单元，余下的处理都是数字量，这对有信息处理能力的PLC并不难。中、大型PLC处理能力更强，不仅可进行数字的加、减、乘、除，还可开方，插值，还可进行浮点运算。有的还有PID指令，可对偏差制量进行比例、微分、积分运算，进而产生相应的输出。计算机能算的它几乎都能算。
这样，用PLC实现模拟量控制是完全可能的。控制的单位值可小到212分之一的测量程值，多数也是足够的。
PLC进行模拟量控制，还有A/D、D/A组合在一起的单元，并可用PID或模糊控制算法实现控制，可得到很高的控制质量。
用PLC进行模拟量控制的好处是，在进行模拟量控制的同时，开关量也可控制。这个优点是别的控制器所不具备的，或控制的实现不如PLC方便。
当然，若纯为模拟量的系统，用PLC可能在性能价格比上不如用调节器。这也是应当看到的。
Fanuc A16B-1000-0030/04C Motherboard ""
FANUC A16B-1000-0030/03B PC BOARD * NO *
Fanuc A16B-1000-0030/02B Master Board Untested AS-IS
Fanuc A16B-1000-0030/02B Control Mainboard
FANUC A16B-1000-0030/02B CIRCUIT BOARD
Fanuc A16B-1000-0030 PC Mother Master Board
FANUC A16B-1000-0030 MASTERBOARD MAIN BOARD and TESTED
Fanuc A16B-1000-0030 Master Board
FANUC A16B-1000-0030 Fanuc 6 Type A Master Board / MORI SEIKI / MAZAK 6M 6T
FANUC A16B-1000-0030 CIRCUIT BOARD
Fanuc A16B-1000-003/03B Master Board
Fanuc A16B-1000-003/02B Master Board
FANUC A16B-1000-0010/08F Motherboard A20B-0008-0630   A20B-0008-0640
FANUC A16B-1000-0010 REV 08F MOTHER BOARD
FANUC A16B-1000-0010 MAIN MOTHER BOARD A16B-1000-0010/10F
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FANUC A16B-0190-0080 A16B01900080 MEMORY BOARD
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Fanuc A16B-0190-006 Circuit Board from 3000C Control
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Fanuc A16B-0190-0010 / 37K Circuit Board from 3000C Control
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Fanuc A16B-0160-0542 - 30G  Circuit Board from 3000C Control
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FANUC A16B-0160-0471/23K CNC PCB BOARD NIB
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FANUC A16B-0160-0210 AMADA CNC BOARD
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Fanuc A14B-0061-B114-02 Input Unit, A20B-007-0340/06A PC Board, CNC Module
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FANUC A14B 0061 B104 02 INPUT UNIT MADE IN JAPAN INDUSTRIAL CIRCUIT BOARD
FANUC A13B-0153-C001, BROADBAND MODEM CIRCUIT BOARD
FANUC A13B-0070-B001 READER UNIT W/ BOARD A20B-0007-0750/07B. GOOD CONDITION
FANUC A13B-0070-B001 READER UNIT  W/ BOARD A20B-0007-0750/07B. GOOD CONDITION
Fanuc A0B-2902-0070/02B Circuit Board
Fanuc A08B-0051-C002 Keyboard Unit
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FANUC A06B-6064-H308 SPINDLE SERVO DRIVE (NO TOP BOARD) ~
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FANUC A06B-6059-H206 #511 AC SPINDLE SERVO UNIT with ORIENT OPTION BOARD
FANUC A06B-6059-H203 A06B6059H203 w/ A20B-0008-0240 POSITIONING BOARD
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Fanuc A06B-6059-C212 Spindle Unit With Top Board A06B-6059-H212 #H594 Servo Amp
Fanuc A06B-6058-H334, Servo Amplifier, Main Board - A06B6058H334
FANUC A06B-6058-H334 TOP BOARD A16B-1100-0330 TESTED
FANUC A06B-6058-H332 SERVO AMPLIFIER (AS PICTURED) MISSING BOARD **
FANUC A06B-6058-H231 SERVO AMPLIFIER W TOP BOARD A16B-1200-0800 /11B NIB
FANUC A06B-6058-H227 SERVO AMPLIFIER W/TOP BOARD ***FREE SHIPPING***
FANUC A06B-6058-H225 SERVO AMPLIFIER W/ A16B-1200-0800/10B TOP BOARD
FANUC A06B-6058-H225 SERVO AMPLIFIER W/ A16B-1200-0800/08A TOP BOARD #2
FANUC A06B-6058-H225 SERVO AMPLIFIER W/ A16B-1200-0800/06A TOP BOARD
FANUC A06B-6058-H225 SERVO AMPLIFIER W A16B-1200-0800/08A TOP BOARD #1