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PLC的可靠性是多年应用和严格实验保证的，无数不**业不同厂商的应用使其的BUG减至少，而单片机系统无法保证这一点。所以单片机系统的稳定性和可靠性要低很多，特别是系统刚开发的这一两年内，庞大的维护和升级费用将使你的成本急距上升。
当然如果你的控制对象量很多，而且对于可靠性要求不高，那么单片机一定是你好的选择，比方说刚才说的空调、电视之类，这些产品的年产量都**过千万台，用单片机开发完全可以做到低的成本，并且家用电器对于可靠性要求也不高，按两下按键不动，大不了再重新按一下，而在工控场合这是绝不允许的，比方说锅炉该动不动就有可能造成很大的事故。
IPC（工控机）和PLC的选择
T312-F0-F3-I/O Juniper 12 Port BNC Back Card
ERX-GEFE256M-MOD Juniper E Series GE Front Card
NEW JUNIPER EX-SFP-10GE-LR Juniper 10GBase-LR SFP+ Tran
Juniper M7ibase-2FE M7i Wired Router CFEB/FAN GF
Juniper NS-5400-DC NOB 3X DC Power All Accessories GF
Juniper NSMXpress NSMCM NS-SM-A-BSE GF
Already loaded up with NS-SM-ADD-50D
Juniper Netscreen NS-5400-P01A-S00 w/ 3 x NS-5000-8G
Juniper EX 2200 48P - Switch - L3 - manag EX2200-48P-4G
Brand New & Ready To Ship From A US Authorized Reseller
Juniper Allegro MX Ultra-Rugged Data Collector, WiFi BT
Juniper M10BASE-DC w/ RE-333-768, PE-1GE-SX-B + DC
1 Year Warranty - No Reasonable Offers Ever Refused!
Juniper M120-FPC3 for M120 Warranty
JUNIPER SECURE SERVICES GATEWAY SSG-550M-SH-DC-N *!!!
One-day shipping available
JUNIPER NETWORKS PB-1OC48-SON-SFP 1 PORT PIC NOB
1 PORT OC48 SON SFP NEW OPEN BOX 90 DAY WARRANTY
Juniper PE-1GE-SFP-QPP SFP-1GE-SX PIC M7i M10i Router
Juniper M10BASE-AC w/ RE-333-768, PE-1GE-SX-B, AC PWR
1 Year Warranty - No Reasonable Offers Ever Refused!
JUNIPER NETWORKS PE-1CHSTM1-SMIR PIC REFURBISHED
TESTED 90 DAY WARRANTY
Juniper TK6000 Ultra-Rugged Data Collector, BT & WiFi
Nice Juniper Netscreen NS-208-001 DC Adv Firewall *
Juniper Ex Series Switch EX4200-24P Ex4200 24port 10/10
One-day shipping available
Juniper PIC PE 1GE SFP for M7i,M10i non-qpp, 1 year WTY