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S7-300PLC的選型原則是據生產工藝所需的功能和容量進行選型，并考慮維護的方便性、備件的通用性，以及是否易于擴展和有無特殊功能等要求。選型時具體注意以下幾方面：
(1)有關參數確定。一是輸入/輸出點數(I/O點數)確定。這是確定PLC規模的一個重要依據，一定要根據實際情況留出適當余量和擴展余地。二是PLC存儲容量確定。注意當系統有模擬量信號存在或要進行大量數據處理時，其存儲容量應選大一些。
(2)系統軟硬件選擇。一是擴展方式選擇，S7-300PLC有多種擴展方式，實際選用時，可通過控制系統接口模塊擴展機架、Profibus-DP現場總線、通信模塊、運程I/O及PLC子站等多種方式來擴展PLC或預留擴展口;二是PLC的聯網，包括PLC與計算機聯網和PLC之間相互聯網兩種方式。因S7-300PLC的工業通信網絡淡化了PLC與DCS的界限，聯網的解決方案很多，用戶可根據企業的要求選用;三是CPU的選擇，CPU的選型是合理配置系統資源的關鍵，選擇時必須根據控制系統對CPU的要求(包括系統集成功能、程序塊數量限制、各種位資源、MPI接口能力、是否有
PROFIBUS-DP主從接口、RAM容量、溫度范圍等)，并好在西門子公司的技術支持下進行，以獲得合理的選型;四是編程軟件的選擇，這主要考慮對CPU的支持狀況，我們的體會是：STEP7V4.0對有些型號的CPU不支持，硬件組態時會發生故障出錯，而STEP7V5.0則不存在這種問題。
二、設計及使用注意事項
1. 設計注意事項
設計時主要應注意以下幾方面：
(1)PLC輸出電路中沒有保護，因此在外部電路中應設置串聯熔斷器等保護裝置，以防止負載短路造成PLC損壞。熔斷器容量一般為0.5A。
(2)PLC存在I/O響應延遲問題，因此在快速響應設備中應加以注意。MPI通信協議雖簡單易行，但響應速度較慢。
(3)編制控制程序時，好用模塊式結構程序。這樣既可增強程序的可讀性，方便調試和維護工作;又能使數據庫結構統一，方便WinCC組態時變量標簽的統一編制和設備狀態的統一顯示。
(4)硬件資源。要合理配置硬件資源，以提高系統可靠性。如PLC電源配電系統要配備冗余的UPS不間斷電源，以排除停電對全線運行的不利影響。又如對電機的控制回路要進行繼電器隔離，以消除外部負載對I/O模塊的可能損壞。另外，系統設備要采用獨立的接地系統，以減少雜波干擾。
Allen Bradley SLC500-10 Slot Rack w/Proc 1747-L542/C &
Norgren Smart Pumps / Vacuum System - VMS 2110 24 V
Fanuc AC Servo Motor A06B-0127-B175
Allen-Bradley 1794-OB16P Flex I/O Output Module
Olsun 45 KVA 480 HV / Dry type Class AA Transber
415Y/240-120 LV / 3 Phase
Goodyear FHP 4L280 Power Transmission Belt
Fanuc AC Servo Motor A06B-0153-B675
PILZ Pnoz 11 Safety Relay - Emergency Stop Relay
FANUC A16B-1212-0871/?12C POWER SUPPLY
Allen Bradley 1785-L40B/D Controller w/NP5 Kit
Allen-Bradley 1794-ADN Flex I/O DeviceNet Adapter
Allen Bradley AB 104-B110NZ243 Series A Contactor
Reversing Starter
ALLEN BRADLEY 500-DOD920 New In Box / 115-120 V
Honeywell Temperature Controller L456A 1008 NIB
2-Wire 250V Max - 5 Ft copper capiliary
NIB Honeywell Serviceline Pneumatic Thermostat
TP970A 2038 4 (Direct acting, range 60-90F)
Allen-Bradley 1794-IB10x086 Flex I/O Combo Module
Allen-Bradley 1794-IB16 Flex I/O Input Module w/TB3Base
Reliance Electric Variable Speed Drive - 125 HP
pulled from operating Machining center
Fanuc A16B-2201-0891/?03A Ethernet Remote PCB
Fanuc A05B-2316-C105 3 Slot Back Plane
Fanuc AC Servo Motor A06B-0356-B756
Fanuc Robotics - Brake Release Unit / 6 axis capability
FANUC A16B-3200-0040/?04C MAIN CPU PCB MODULE
FANUC A16B-1212-0931/?03B EMERGENCY STOP CONTROL
BOARD
B74 GATES HI-POWER II VBELT
GATES Part # 3740 Truflex Belt 21/32"x 74" 17x1880mm
FANUC Servo Amplifier Unit A06B-6089-H105
GATES Part # 3740 {Truflex Belt 5L 21/32" x 74"}
CONTROL TECHNIQUES 9500-8603 QUANTUM III DC DRIVE
15-30 HP
Moog Brushless Sevro Motor / Model 306-131A - NEW
Allen Bradley PowerFlex 70 AC Drive2HP 20AD3P4A3AYNNNN?N
NIB Honeywell Heavy duty Heating/Cooling Thermostat
T6051A 1016
Square D Reversing Starter 8702 Type SDO-2 -New In Box
Square D 1S1FIS 1 KVA General Purpose Transber Used
Allen Bradley AB 104-A75NZ243 Series A Contactor
Reversing Starter
Honeywell Ultraviolet Flame Amplifier - 7800 Series NIB
R7849 A 1023 - Solid State plug in amplifier
Allen Bradley AB 104-B180ND3 Series A Contactor
Reversing Starter
NIB Honeywell Sailswitch - 43A 1003 1 (2wire / 250Vmax)
Allen Bradley 1747-L511/B SLC 5/01 CPU 1747L511 / B
Allen Bradley 1756-DHRIO/B Logix DH+/RIO Communication
Allen Bradley 1747-L541/B SLC 500 5/04 1747L541
Allen Bradley 1747-L542/B SLC 5/04 CPU 1747L542 / B
Reliance 0-51874 Module Static Seq SCCA
Reliance 0-48652 PC Board Meter Calibration
Reliance 0-48652-25 PC Board
Reliance 0-48654 PC Board- AC Tach Rectifier
Reliance 0-49017-83 Card Pack
Reliance 0-51375 PC Board
Reliance 0-51418-4 PC Board
Reliance 0-51419 PC Board Gate Coupling
Reliance 0-51421-3 RC Network
Reliance 0-51425-1 Rectifier - AC Tach
Reliance 0-51426 PC Board- Field Loss
Reliance 0-51444 Driver Board
Reliance 0-51445 Controller Board
Reliance 0-51446 PC Board
Reliance 0-51447-3A PC Board - PC Network- 460V
Reliance 0-51486-24 PC Board
Reliance 0-51486-39 PC Board
Reliance 0-51486-56 PC Board ETR - 14 Pin
Reliance 0-51811-1 Tester Card- Voltmeter- TSTB
Reliance 0-51829-2 PC Board Linear Voltage- LVTC
Reliance 0-51831 PC Board Current Voltage CVTB
Reliance 0-51831-1 PC Board Current Voltage CVTB
Reliance 0-51831-3 PC Board Current Voltage CVTD
Reliance 0-51839-4 PC Board Relay Card IRCE
Reliance 0-51845-1 PC Board Power Supply PRSB
Reliance 0-51846-25A PC Board
Reliance 0-51847 Voltage Detector Board VLDB
Reliance 0-51848-1 PC Board
Reliance 0-51849 PC Board Gate Driver GBCA
Reliance 0-51851-5 PC Board Control Regulator
Reliance 0-51851-6 PC Board Control Regulator- CRCG
Reliance 0-51862-1 PC Board Universal Sum AMP
Reliance 0-51865 (CLDA) PC Board- Current Loop Drive
Reliance 0-51865-1 (CLDB) PC Board- Current Loop Drive
Reliance 0-51865-9 Module Current Loop DRV-CLDK
Reliance 0-51874-2 PC Board Static Sequence SSCC
Reliance 0-51881-1 Circuit Card Ext Term CNTR- ETCB
Reliance 0-51884 LSCA Moldule LOG SIG COND
Reliance 0-51890-6 PC Board DPSG
Reliance 0-51893-2 Field Controller - FCCC
Reliance 0-51893-3 PC Board- Field Exciter FCCD
Reliance 0-51899-2 Control Module Extender Card
Reliance 0-51901-A Armature Reg.
Reliance 0-51902 Driver Card
Reliance 0-51902-5 PC Board
Reliance 0-51903-A Power Supply
Reliance 0-52012 PC Board Gate Driver MaxPak
Reliance 0-52014 PC Board Timed Voltage Reference
Reliance 0-52824 Current Loop Regulator
Reliance 0-54349-2 PC Board Phase
