In a coal mine, two devices are communicating at 4,8kbaud over two-wire rs485 bus. There's lot of noise (with a lot of lost bytes), because the power cables from AC-drives lay near, and there's not really a way to avoid it.
Unfortunately, I can't improve "communication skills" of devices...
Hi, All,
I have a typical PID control application and I'm still not sure what's the right name for it.
Process - heat exchanger (oil cooled by water)
Controlled variable - temperature of oil after the heat exchgr.
Manipulated variable - "water in heat exchgr." inlet valve position
There are...
I have an S5 PLC with CP1431 on ethernet (H1 bus). Now I need to read the data (several datablocks) from this PLC to other PLC (S5 or S7 - I can choose).
Normally, I must configure an ethernet connection (for example, ISO Transport) and download new configuration into both partners.
Can I...
Hi All,
I'm looking for a good free reading about ISA-S88 Batch Control. Who know something better than
http://www.batchcontrol.com/s88buddy.shtml
Thanks!
Hi All,
I'm looking for a good free reading about ISA-S88 Batch Control. Who know something better than
http://www.batchcontrol.com/s88buddy.shtml
Thanks!
Hi, All,
Due to corporate rules we invest only in Siemens PLCs. Thus I'm replacing existing and running SLC500 (with SLC 5/03 cpu, couple of digital output boards and couple of digital input boards) with Siemens PLC.
From contractor vendor I have hardcopy of plc program, but I'd prefer to read...
Listening profibus on PA side for maintenance purpose - is it possible?
We've got Siemens S5-155 PLC (CPU948) with IM-308C serving number of profibus PA devices. There are 12 DP/PA couplers connected all to the same DP cable from IM308-C.
To reduce load on existing IM-308C, I'm going to add...
Hi, All! I think, most of PLC engineers have to deal with equipment interlocking diagrams.
Can anyone point me to best practices of drawing these diagrams?
For example, if motor A stops, then motor B stops and will require manual start. This would be an arrow from A to B.
What if B will...
