2.2.3来自PLC系统内部的干扰
主要由系统内部元器件及电路间的相互电磁辐射产生，如逻辑电路相互辐射及其对模拟电路的影响，模拟地与逻辑地的相互影响及元器件间的相互不匹配使用等。这都属于PLC制造厂对系统内部进行电磁兼容设计的内容，比较复杂，作为应用部门是无法改变，可不必过多考虑，但要选择具有较多应用实绩或经过考验的系统。
3 PLC控制系统工程应用的抗干扰设计
为了保证系统在工业电磁环境中免受或减少内外电磁干扰，必须从设计阶段开始便采取三个方面抑制措施：抑制干扰源；切断或衰减电磁干扰的传播途径；提高装置和系统的抗干扰能力。这三点就是抑制电磁干扰的基本原则。
Allen Bradley AB 1336S-C075-AX-FR-L6 75 HP 600V Drive
Square D QED I-Line SwitchBoard 2000 Amp 277 / 480 V
Fanuc A06B-6076-H101 6 Axis Servo Amplifier REM in box.
GE AKR-7D-50 1600 A Amp Air Breaker RMS-9 MVT LSIG EO
Acme Transformer 500 kVA 600Y/347 480Y/277 380Y/220
Allen Bradley AB 1336S-B100-AA-EN4-HA2-L6 Ser D 100 HP
Westinghouse 350 HP 1765 RPM Induction DP Motor 5009-S
Allen Bradley AB 1336S-B075-AN-EN-L6 75/100 HP V Drive
GE AKR-6D-75 3200 A Amp Air Breaker MVT Trip LSG 635 V
Square D NHL361200 NHL 1200 Amp A 1200A High Interrupt
Waukesha 030U2AP 030 Positive Displacement Pump PD REM
Allen Bradley AB 1336F-B050-AA-EN 50 HP VF VS Drive REM
Westinghouse SPB 100M Pow-R Breaker SPB100M 2000 Amp A
Siemens SBH 2012 SBH2012 SBH2012DV 1200 Amp SB12TP02G
Siemens SBH 2012 SBH2012 SBH2012F 1200 Amp SB12TP02G
Siemens SBS 2012 SBS2012 SBS2012DV 1200 Amp SB12TP02G
Siemens SBH 2012 SBH2012 SBH2012DV 1200 Amp SB12TP02G
Siemens SBS 2012 SBS2012 SBS2012F 1200 Amp SB12TP02G
Siemens SBH 2012 SBH2012 SBH2012F 1200 Amp SB12TP02G
Siemens SBS 2016 SBS2016 SBS2016F 1600 Amp SB16TP02G
Siemens SBH 2016 SBH2016 SBH2016F 1600 Amp SB16TP02G
Siemens SBS SBH 5000 Drawout Convertion Kit w. Fingers
Square D Sz Size 7 Motor Starter Reversing 8736 SJO1S1
Trane Centravac 400 HP Motor Controller Starter 460 V
GE Power Break PowerBreak TPMMF76 2500 Amp 2500A A
Mettler Toledo Hi-Speed HiSpeed Checkmate 2 CM6400CR-CM
Square D Magnum 15 kV MG DSE-65-750-1200 Amp A 15MGSB-4
Like New Condition GE Magnablast Vacuum Retrofit
Waukesha 030U2AP 030 Positive Displacement Pump PD REM
GE AKR-7D-50 1600 A Amp Air Breaker AC RPO LSIG EO
GE Power Break PowerBreak TC2525SS 2500 Amp 2500A A
Tranter Superchanger Plate Frame Heat Exchanger S3UJ32
Siemens Sentron SXML3800G0 800 Amp 800A A Bus Plug 3P3W
Cutler-Hammer Magnum DS MDS616 1600 Amp Digitrip 520M
BBC Type K1600 K 1600 1600 Amp 1600A Air Breaker LI
