对电磁干扰或射频干扰比较敏感的装置周围，**不要选用交流电激励的继电器。选用直流继电器要选用带线圈瞬态抑制电路的产品。那些用固态器件或电路提供激励及对尖峰信号比较敏感地地方，也要选择有瞬态抑制电路的产品。
2、按输入信号不同确定继电器种类
按输入信号是电、温度、时间、光信号确定选用电磁、温度、时间、光电继电器，这是没有问题的。这里特别说明电压、电流继电器的选用。若整机供给继电器线圈是恒定的电流应选用电流继电器，是恒定电压值则选用电压继电器。
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PEYER SG PI-120 ConTROL UNIT 100-240V, 50-60HZ, 80VA PI-I2 PI-12
PEYER SG PI-120 ConTROL UNIT 100-240V, 50-60HZ, 80VA PI-I2 PI-12 PI120
NIB GE FANUC IC630CCM310A I/O
EMERSON MOTION ConTROL PCM-3 3-AXIS (X-Y-Z) ConTROLLER PCM3P/N: 960019-01
GE FANUC IC600CM548K 8K LOGIC FAB. NO. 44A723621-001
REPAIRED ALLEN BRADLEY 2760-RB/A
YASKAWA SGDH-02BE SERVOPACK SERVO MOTOR SER D 100-115V 50/60HZ 5.2 AMP
ConTROL TECHNOLOGY 901B-2550
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HonEYWELL 3LC72 DETECTOR 3 LIGHT CURTAIN TRANSMITTER 9674412 72'' LENGTH
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RELIANCE ELECTRIC 107172-001X 84543-108A 0-48652
HUGHES LAN SYSTEMS A005119-04 REV. A HUB
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EMERSON PCM-15 PROGRAMMABLE MOTION ConTROL DRIVE MODULE 960113-01 FW-401168-01
NIB HonEYWELL 621-1160R 16 POINT 115VAC INPUT 16 POINT
FANUC A20B-8001-0620/01A INTERFACE BOARDA350-8001-T624/01
HonEYWELL DC3001-0-000-1-00-0111 TEMPERATURE ConTROLLER UDC3000 10AMP 120VAC