不同的PLC产品，对电源的要求也不同，这里包括电源的电压等级、频率、交流纹波系数和输入输出的供电方式等。
对电磁干扰较强、而对PLC可靠性要求又较高的场合，PLC的供电应与动力供电和控制电路供电分开；必要时，可采用带屏蔽的隔离变压器供电、串联LC滤波电路等。在设计时，外接的直流电源应采用稳压电源，供电功率应留有20%~30%的余量。对由控制器本身提供的直流电源，应了解它所能提供的*电流，防止过电流造成设备的损坏。
KOYO DIRECT LOGIC 405 PLC SYSTEM DL405 H4-ECOM D4-440
KOYO DIRECT LOGIC 405 PLC SYSTEM DL405 H4-ECOM D4-440
D-STAR INSTRUMENTS DFW-20 WAVELENGTH DETECTOR
DIALOGIC DM/IP241-1T1-PCI-100BT
ANATEL A-1000 SP200 SAMPLE PUMP SP-200
SIEMENS COMMUNICATION MODULE CM 104
D-STAR INSTRUMENTS FIXED WAVELENGTH DETECTOR DFW-20
BENTLY NEVADA 3500/94 VGA DISPLAY MODULE
BIO-TEK ELx800 UNIVERSAL MICROPLATE READER
HP AGILENT 8350B SWEEP OSCILLATOR MAINFRAME W/ RACK MOU
HP AGILENT 8350B SWEEP OSCILLATOR MAINFRAME
GE FANUC PPR TAPE PUNCHER A13B-0117-B003 A13B0117B003
WOHLER AMP2-SDA DIGITAL AUDIO MONITOR PANEL AS IS
GE FANUC INTELLIGENCE PANELPC 44A751082-011R11 NOB
AGILENT 1100 SERIES G1160A SWITCHING VALVE
BIO-TEK ELX405 AUTO PLATE WASHER ELX405VR
CAMBRIDGE TECHNOLOGY 7715 MICROPLATE LUMINOMETER
SCHLUMBERGER SOLARTRON 1250 FREQUENCY ANALYZER AS IS
POLYCOM VSX 7000 VIDEO CONFERENCE SYSTEM
GE FANUC CPU 374 MODULE IC693CPU374
MET ONE LASER PARTICLE COUNTER A2100PLUS-1-115 AS IS
GE AKTA AMERSHAM PV-908 VALVE 18-1108-41
