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3.CPU模塊中的存儲(chǔ)器
存儲(chǔ)器分為系統(tǒng)程序存儲(chǔ)器和用戶程序存儲(chǔ)器，系統(tǒng)程序相當(dāng)于個(gè)人計(jì)算機(jī)中的操作系統(tǒng)，它使PLC具有基本的智能，能完成PLC設(shè)計(jì)者的規(guī)定的各種工作。系統(tǒng)程序由PLC的生廠家設(shè)計(jì)并固定化在ROM（只讀存儲(chǔ)器）中，用戶不能讀取。用戶程序由用戶設(shè)計(jì)，它使PLC能完成用戶要球的特定功能，用戶程序存儲(chǔ)器的容量以字節(jié)（B）為單位。
（1）。隨機(jī)存取存儲(chǔ)器（RAM）
用戶可以用編程裝置讀出RAM中的內(nèi)容，也可以將用戶程序?qū)懭隦AM，因此RAM又叫讀/寫存儲(chǔ)器。RAM的工作速度高、價(jià)格便宜、改寫方便。
（2）。只讀存儲(chǔ)器（ROM）
ROM的內(nèi)容只能讀出，不能寫入。
（3）?？梢噪婇叱隹删幊痰闹蛔x存儲(chǔ)器（EEPROM）
S7-200用EEPROM來存儲(chǔ)用戶程序和長(zhǎng)期保存的重要數(shù)據(jù)。

B & S 1" ARBOR CUTTER NO. 3 10D.P. 35 TO 54 T D+f .2157-14-1/2P.A?.WR3 NNB


B & S 1" ARBOR CUTTER NO. 3 10D.P. 35 TO 54 T D+f .2157-14-1/2P.A?.WR3 NNB
 
MASKA BUSHING NIB SFX2-1/8
 
PANASONIC 12MM 1:1.4 TV LENS WV-LA12B2
 
3/4DIAX3/4SNK DE 2-FLUTE HSS ENDMILL T2245 NIB
 
R & N TAP 5/8-18 NF 4 FLUTE
 
MAGNALOY 800 HUB 3-3/8"X7/8" COUPLING M8003122B NIB
 
F&D 1"-8 2-1/2 SQUARE BOLT DIE 297 NIB
 
WALTON 3/4" 5 FLUTE PIPE TAP EXTRACTOR 20755
 
KAMOSEIKO KAMO 1/20G BALL REDUCER GEAR REDUCER BR65SH-20G-8T
 
NATIONAL OIL SEAL 50254 NIB, LOT OF 2
 
SPEEDLINE SS 2-1/2" REDUCER PIPE WP316LW DGRI
 
HS 4-FLUTE TAP M10X1.25
 
ATRA-FLEX FLEXIBLE COUPLING SPACER BODY 3.6 M1 S 3.5
 
CARBIDE INSERT 7ZC8137-14 *NEW,LOT OF 8*
 
PHD * WIDE MOUTH BEAM CLAMP LOT OF 3 * 4IP
 
NO. 33 WIRE DRILL BIT 25 IN BAG
 
AERO-MOTIVE 300LBS 1/4" BALANCER TROLLY BT3PRW
 
5/8" HEX HEAD BOLT 7/16-14X2 1/2" BOLT LOT OF 50
 
MARPOSS M1 ELECTRON 66.90 / 67.10mm MANUAL BORE GAUGE 1784066842
 
COOPER 2-4LBS CAPACITY BL-4A GARDNER-DENVER BALANCER
 
4-FLARE 1.375MM GR. C-Z END MILL 248881-1
 
GTD M24x1 HS G D3 J2206 P
 
STANDARD TOOL CO. 1 1/4 X 1/4 X 1/2 SIDE MILL 810 HS
 

M30X1.50 D6 HSS
 
DODGE 2-7/16" BORE SIZE TAPER LOCK BUSHING DODGE 3020 X 2-7/16 KW *NEW*
 
1-1/2" L TAP
 
CLEVELAND DT CO. QUICK-SET 19/32-21/32 6-5/16" SIZE-C ADUJSTABLE TAP
 
HAND TAP GTD 1-14 NS HS/ G H4 E1305 *NEW NO BOX*
 
TRW NO.8 16/16" TWIST DRILL 205M/M NIB
 
TORRINGTON-FAFN?IR CAM FOLLOWER CF-1-S
 
TELEDYNE CARBIDE INSERT MP-37 CNMG-432A-3 *NEW, LOT OF 10*
 
ATLAS COPCO * ELECTRIC NUT RUNNER * ETV S7-30-10-CTADS
 
UNKNOWN MFG 2-FLUTE TAPER SHANK TWIST DRILL 1-7/32
 
HOBBS QUARTZ 12-60VDC 1/10 HOURS METER D147478
 
HIGH SPEED 2FLUTE LE FORGE STEEL 27/32 H6450
 
BUTTERFIELD UB 1-1/4" NC 7 4 FLUTE HAND TAP HSG 765 GH4
 
PARKER * FITTING NIB * XPTFM1PK4
 
MORSE 2-FLUTE 31/32 9-1/4" HS TWIST DRILL SHANK
 
TORRINGTON BN4S SPHERICAL ROLLER BEARING NIB 8SF14
 
CLEVELAND TAP CT-43099 7/16 - 20NF HS M4G H8 3 SPIRAL FLUTE
 
25MM PRESS PUNCH 10 IN BAG 95108-55
 
CARD USA HSA 1/2 20 NF N2 4 FLUTE
 
HANSON WHITNEY #24577 1/2-20 NF HS-G TAP 4 THREADS H3
 
GRACO SLEEVE GUIDE 6-1/2" ID 617414
 
SPRAYING SYSTEMS 1/2 x 1/2 -SS 36275,NNB
 
RIDGID R.H. 1-1/4"-12 UNF HSS UNIVERSAL BOLT DIES NIB 48350 103772