厦门仲鑫达自动化设备有限公司
S7-300 PLC的选型原则是据生产工艺所需的功能和容量进行选型,并考虑维护的方便性、备件的通用性,以及是否易于扩展和有无特殊功能等要求。选型时具体注意以下几方面:
(1)有关参数确定。一是输入/输出点数(I/O点数)确定。这是确定PLC规模的一个重要依据,一定要根据实际情况留出适当余量和扩展余地。二是PLC存储容量确定。注意当系统有模拟量信号存在或要进行大量数据处理时,其存储容量应选大一些。
(2)系统软硬件选择。一是扩展方式选择,S7-300 PLC有多种扩展方式,实际选用时,可通过控制系统接口模块扩展机架、Profibus-DP现场总线、通信模块、运程I/O及PLC子站等多种方式来扩展PLC或预留扩展口;二是PLC的联网,包括PLC与计算机联网和PLC之间相互联网两种方式。因S7-300 PLC的工业通信网络淡化了PLC与DCS的界限,联网的解决方案很多,用户可根据企业的要求选用;三是CPU的选择,CPU的选型是合理配置系统资源的关键,选择时必须根据控制系统对CPU的要求(包括系统集成功能、程序块数量限制、各种位资源、MPI接口能力、是否有
PROFIBUS-DP主从接口、RAM容量、温度范围等),并最好在西门子公司的技术支持下进行,以获得合理的选型;四是编程软件的选择,这主要考虑对CPU的支持状况,我们的体会是:STEP7 V4.0对有些型号的CPU不支持,硬件组态时会发生故障出错,而STEP7V5.0则不存在这种问题。 Applied Materials/AMAT 0200-09478 Plate gas distr. uppe
Applied Materials 0140-20257 REV A CABLE
Applied Materials / AMAT 0020-20558 Plate
LOT OF 3 Applied Materials 002179310-P2 002179310P2 W/0
Applied Materials/AMAT 0020-31695 Spacer Wedge HRTV
LOT OF 4 Applied Materials 0190-25613 300MM BONDED SLIT
Applied Materials/AMAT 0020-91693 ADAPTER NON-GALLING C
Applied Material/AMAT 2588021-01 2536234-01 2819864-01
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Applied Materials 19-053642-00 REV F
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Allen-Bradley Size 5 2100 Centerline 250 Amp 45" Breaker MCC Bucket AB Sz5 250A
Allen-Bradley Size 5 2100 Centerline 400A 45" Breaker MCC Bucket AB 709-F0D2094
Allen Bradley AB 1336F-BRF200-AN?-EN VS Drive MCC Bucket 60A
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Allen-Bradley Size 5 2100 Centerline 400A 64" Fusible MCC Bucket AB 709-F0D103
Allen Bradley AB Starter Bucket Size 4 Reversing Breaker 150A MCC Bucket 52 inch
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Allen Bradley 2100 Centerline Breaker 100A AC Contactor MCC Bucket 500L-DOD93
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