PLC5 multiple sockets

[gromit 4]

Gentlemen, Is the PLC5 capable of “multiple socket connections” . . . ability to connect to two different HMI systems?

[Ken Roach 194]

Yes; the PLC-5E or the 1785-ENET supports up to 64 simultaneous TCP socket connections. PLC-5E systems are routinely connected to multiple HMIs and multiple programming terminals. The only way you're likely to run out of TCP connections is if the PLC-5 is also performing as a "data concentrator" and is sending MSG instructions to dozens of other controllers. Just because you have TCP connections doesn't mean you'll have enough processor bandwidth to support them: I've heard plenty of stories about online monitoring becoming dog-slow because somebody put in a 50 millisecond scantime trend on another computer.

[gromit 4]

Really good info Ken. Thanks for your comprehensive response.

[Powered By Dodge V8 0]

PLC-5 has builtin DH+ 2-wire as well. If you don't have an "E" version processor, or you don't want the ethernet side car, then you can get Panelview Plus terminals with the DHRIO addon board. These will talk DH+ to the PLC-5 all day long, and you can have something like 77 (octal ... that's 63 actual [decimal] ) devices total per channel - most PLC-5's have at least 2 DH+ channels.