PLC的快速信号在慢速反应的DCS的操作站上显示。经测定，一个微动开关的动作要经过几秒以上的时间才能在DCS的操作站上表现出来。有的DCS甚至需要8秒。另一个互联办法是把PLC的个别信号用硬线连到DCS的输入板上，这样输入的点数很少，成本比较高。有的DCS在DCS网络上设计一个结点，该结点专门用来读取PLC的信号。把PLC的信号送入DCS的网络是比较困难的。缺点是开发接口的费用很高。即使开发成功，接口也经常发生故障。
Square D QMB Branch Switch 200 Amp QMB324W Fusible 240V
Honeywell ISSC 621-1101 Isolated Input Module 6211101
CH/Westinghouse HJD3250F 250 Breaker w/JT3200T 200A Trip HJD3200 Cutler Hammer
Cutler Hammer WH HJD HJD3250F JT3200T HJD3200 200 A Amp
Westinghouse HMCP HMCP250W5W 250 A 250Amp Amp 250A
Westinghouse Panelboard Switch FDPS364 200 Amp A FDP
CH/Westinghouse HJD3250F 250A Breaker w/JT3200T 200A Trip HJD3200 200 Amp Cutler
ABB 437W7790 Type 32R Circuit Shield Reverse Power Relay Range 22-260 W 24 VDC
Siemens 6SN1114-0NB01-0?AA1 611U Option-Profibus DP3 NIB
Bussmann JCL-2R 70A Fuse JCL2R 5.08kV R-rated Buss NIB
Bently Nevada XDCR I/O & Record Terminals 81545-01 Alarm Relay Outputs 78462-01
Bently Nevada 3 Wire RTD Input Channel 82368-01 79532-01 PWA79532-01 F