钥匙开关所有的350-374型CPU都有钥匙开关，但是一些版本的CPU固件并不支持钥匙开关的所有功能(参看本章之前的“CPU 版本的说明”) .这些不同在这部分中加以说明，注意在一些CPU中的钥匙开关标记有ONOFF和OFF/STOP，

MODICON 140 CPS 114 10 AC PS POWER SUPPLY WITHOUT DOOR

SCHMERSAL AZM 161SK-24RKA-024 SOLENOID-LATCHI?NG SAFETY

ALLEN / EUPEC 110463-TT170N 13J3 SP-135109 POWER BLOCK

KAMOSEIKO KAMO 1/20G BALL REDUCER GEAR REDUCER BR65SH-2

KAMOSEIKO KAMO 1/20G BALL REDUCER GEAR REDUCER BR65SH-2

MTS 2121209 WT TRANSMITTING ANTENNA, LOT OF 12,

ACME ELECTRIC 25A1-9400002-A OUTPUT POWER SUPPLY, NIB

AMERICAN WELDQUIP 400A MIG WELDING HAND-HELD GUN MODEL

PEPPERL + FUCHS FREQUENCY-VOLTA?GE CONVERTER KFU8-FSSP-1

ALLEN BRADLEY 1770-FAC KEYBOARD REFURBISHED

MKS INSTRUMENTS TYPE 660 DIGITAL PANEL METER 660A10

Electro Cam SOLID STATE ROTARY CAM LIMIT SWITCH EC-3008

MITSUBISHI ELECTRIC FREQROL S500 0.4K VARIABLE FREQUECY

ROSS 2773A8936 110/120 VOLTS 50/60 HERTZ SOLENOID VALVE

B/W CONTROLS, 7010W4C20, FLOAT SWITCH, 26 PSI, 120 / 24

BLACKMER, 414B, ROTARY HAND PUMP, 1 1/4″ NPT, LARGE FRA