输入信号和输出信号均为模拟量的控制系统称为模拟量控制系统。过程控制系统是指被控制量为温度、压力、流量、液位、成份等这一类慢连续变化的模拟量控制系统。
如图6-28所示为典型的模拟量闭环控制系统结构框图。图中，虚线部分可由PLC的基本单元加上模拟量输入/输出扩展单元来承担。即由PLC自动采样来自检测元件或变送器的模拟输入信号，同时将采样的信号转换为数字量，存在*的数据寄存器中，经过PLC运算处理后输出给执行机构去执行。
EXIDE ELECTRONICS MK II U INVERTER 118302461C
GENERAL ELECTRIC CIRCUIT BOARD DS3800D**1B1A 6BA01
FISHER CIRCUIT BOARD DM6411X1-A1 46A355AX022
MILLTRONICS AIRANGER I/O ML10LI244 51012441
GENERAL ELECTRIC GE BOARD CARD 44B294288-002/2 44A294520-G02 44A294520
GENERAL ELECTRIC GE BOARD CARD 44B294288-002/2 44A294520-G01 44A294520G01
MILLTRONICS CIRCUIT BOARD CARD MLIOLI25I 01882369 GR1
Allen Bradley Interface Card 1784KTC
GENERAL ELECTRIC GE PWMP2B 44A398786-G01
NEWAVE SA POWERWARE EXIDE NW4002D Rom 142/03 CH6572
BAILEY CIRCUIT BOARD NDCS03 6634045JI
NEWAVE SA POWERWARE EXIDE NW4002D2 40/03 CH6572
NEWAVE SA POWERWARE EXIDE NW4002D2 Rom 142/03 CH6572
RELIANCE ELECTRIC 0-51445-A
Micro Controller Intfc 106146801
CONTROLOTRON 994-4A 994-4A-1
CONTROLOTRON 994-4AN35 994-4A-1
CONTROLOTRON 994-4ALDVN35 994-4A-1
ALLEN BRADLEY 117481 M0068551 A083479 REV 13
WST Powerelectronics Circuit Board Card MCB 27-2540-03 27-2570.03 27-2540-.03
ABB YPG 106A YPG106A YT204001-BL/2 2668 184-466/2
CONTROL CHIEF CORP BOARD CARD 8002-4009 REV I
CONTROL CHIEF CORP BOARD CARD 8002-4009 REV J
GENERAL ELECTRIC Programmable JUNIOR IC609SJR114A
BAILEY POINT TABLE MODULE NPTM01 6631993A3
Micro Controller Circuit 105652101-B
ABB ASEA CIRCUIT BOARD CARD DSPC150 57310256-AF/3 57310256AF/3
HONEYWELL / ACCURAY 60130571 BF4MDC 085156-001
GE PC Board Card IC3600LGXA1 IC3600LGXA1A IC3600
FISHER ROSEMOUNT CIRCUIT BOARD FIC 4-20 MA 10P54440002 REV. E/G
T C TC CIRCUIT BOARD CARD 640324U
NEWAVE SA POWERWARE EXIDE BOARD CARD 118302575A 101072548 110071513
NEWAVE SA POWERWARE EXIDE CIRCUIT 118302575A
NEWAVE SA POWERWARE EXIDE CIRCUIT 118302568B
INTERGY SWICHTEC POWER SYSTEMS 350-00072-44C
SIEB & MEYER AC SERVO MODULE DRIVE 26.39.27 263927
FISHER ROSEMOUNT DH6011 CIRCUIT BOARD CARD DH6011
Nortel NT8D14DAE5 02, X UNIV TRK Circuit Card, RLSE 02, for CS1000
Bristol Babcock I/O CPU Circuit Board Card 392900-02-5 392900
INTERGY SWICHTEC POWER SYSTEMS 350-00072-44B
Toyoda Power Card 1 Optical Comm TXK-2680 R9775
ROCKWELL AUTOMATION S0015PKR M003822357 142395 REV 02
DEIMO CS1274/2 BXYV 06C004518 PC
DEIMO CS1276/2 FXYVZ08C006373 FXYVZ09C007243 FXYVZ08C006320 PC
GE FANUC IC600YB917B
NEWAVE SA POWERWARE EXIDE NW4008F CH-6572
DIAMOND POWER I/O BOARD 346064-1149 3460631041 346064
CONTROLOTRON 994-3-5L
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