１、安装位置PLC不能与高压电器安装在同一个开关柜内。与PLC装在同一个开关柜内的电感性元件，如继电器，接触器的线圈应并联RC消弧电路或续流二极管。PLC应远离强干扰源，如大功率晶闸管装置、高频焊机和大型动力设备等。
２、信号线与功率线应分开布线不同类型线应分别装入不同管槽，信号应尽量*近地线或接地的金属导体。当信号线长度超300M时，应采用中间继电器转接信号或使用PLC远程I/O模块。
３、信号传输通常，当模拟输入输出信号距PLC较远时，应采用4-20mA或0－-10mA的电流传输方式，而不是电压传送方式。传送模拟信号的屏蔽层为一端接地。为了泄放高频干扰，数字信号线的屏蔽层应并联电位均衡线，并将屏蔽层两端接地。
HONEYWELL 51400700-100 DHI BOARD BRAND FACTORY SEALED
DYNISCO G840E-844-52B-K23 RANGE 0-52 BARPUT 24VAC OUTPUT 4-20 MA
SIEMENS 3VF9221-1KM10 SHUNT TRIP / AUXILIARY SWITCH 50 AMP
FISHER PROVOX CL6611X1-FA8 VM03 W/COMM BOARD EXCELLENT TAKEOUT
SQUARE D S-FLEX SFD21CG4YN06 PUMP & FAN CONTROLLER 460V 1 HP.
HONEYWELL 51304286-100 REV.H CS/R MCPU BOARD BRAND
SIEMENS 6AV8100-1CB00-1AA1 TOUCH SCREEN P/N SCD 1597-RT (33) W/ CD & MANUAL
SIEMENS 6SE7022-2FC84-1HF3 POWER MODULE GOOD TAKEOUT
ASEA (ABB) YYT 102D (2668 180-586/1) GOOD TAKEOUT
HAUG STATIC LE DISCHARGG SYSTEM TYPE- EN SL (XLNT)
SIEMENS 64E/32AUSGAENGE I/O MODULE GOOD TAKEOUT
SIEMENS S22767-B1-A100 SAP-S1 V24 TERFACE MODULE
SIEMENS 6ES5955-3LC14 SIMATIC S5 POWER SUPPLY (GOOD TAKEOUT)
SIEMENS 6ES5928-3UB21 PROCESSOR UNIT CPU 928B WITH FLASH 6ES5 374-2KG21
SUNX RS-720H-1 BEAM SENSOR (BRAND )
YASKAWA USAMED-30MS2TD SERVO MOTOR ENCODER UTMAH-B15BS
CUTLER HAMMER 15RBA4-300E 15.5 KW 300E AMP FACTORY
MAYATECH CORPORATION 464290 BRAND NOT
SIEMENS 3RK1301-0BB13-0AA4 FAILSAFE DIRECT STARTER
SQUARE D S-FLEX SFD21CG3Y PUMP & FAN CONTROLLER 1 HP. 230V
EUROTHERM CHESSELL D103950-001-01-01-5098-K12 ( SURPLUS) 120-240 VOLT.
FOXBORO E96P-IA-B CS-E/FN-A MAGNETIC FLOW TRANSMITTER MANUFACTURER REFURBISHED
FUJI ELECTRIC MICREX-SX NP1L-TL1 T-LKMASTER MODULE
RO AS5027.001 ANALOG PUT BOARD (ANA.P. 8 CH)
FUJI FRN0-2C1S-2LJ FRENIC MI VERTER (200-240V) 1.8 AMP
AEG SCHNEIDER DEP218/AS-BDEP-218 DISCRETE PUT (16PT)
ACROMAG 1763-Y-U-1-C TRANSMITTER UNIT TELLIPACK SURPLUS
CUTLER HAMMER D120PS1 POWER SUPPLY SURPLUS
MANNESMAN-DEMAG UD-DPU500V020E10 DEMATIK AC REMAN.
SICK PS95W-24V-ENC (4 AMP POWER SUPPLY) 100-120/200-240 VAC
SIEMENS 6ES7 416-2FK02-0AB0 SIMATIC S7 CPU NO
BERTRONIK GMBH WUPPERTAL SR 101/5 RELAY
FUJI ELECTRIC MICREX-SX NP1Y16T09P6 DIGITAL OUTPUT MODULE
MOELLER EM4-101-DD2 EPANSION MODULE GOOD TAKEOUT
ACCU-CODER MODEL 711 PULSES PER REV. 1200 12V DC
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