Posted 13 Jun 2007 hello, I have an HMI that is slow in writting an input to the PLC. Looking at the PLC online, when I press a button on the touch sreen it takes about a second for that bit to register on the PLC which in turn delays the output on the rung. HMI DP321 PLC DL405 both from Automation Direct. Does anyone have any suggestons. Share this post Link to post Share on other sites
Posted 14 Jun 2007 Normally a 405 CPU is fast. What protocol is used and type of terminal. Check the ligths on the CPU. Rx Tx. The ligth are unfortunately for all the three comm ports, so if more connected to the cpu disconeect it if possible. If you see receives and no transmits there is something wrong. Simple check. Share this post Link to post Share on other sites