MTS Series 793 Application - Manual (Page 394)

MTS MultiPurpose TestWare®
Temperature Control Process
External Control Process Descriptions 394
Controller options with
your controller
Depending on the type of external controller you are programming, the
Temperature Control process may be configured differently. See the following
sections for special considerations.
Eurotherm controllers
Some controllers support a special cabling configuration for Eurotherm
temperature controllers. When a Eurotherm temperature controller is connected
to your system, special Temp Output 1 and Temp Input 1 resources must be
added to your hwi file.
When configured this way, the Temperature Control process sends temperature
commands to the Eurotherm controller through the J51 serial connector at 1 Hz,
and receives temperature feedback (for data acquisition) through the same
connector at 0.5 Hz (EI-BISYNCH protocol). In the Temperature Control
process parameters window, you can set a Control Tolerance and a Dwell
Period. If your configuration includes an additional analog input resource for an
external temperature conditioner, you can also set the Monitor Tolerance.
Other controllers with
Program with Feedback
If the programming channel is configured as Program with Feedback, the
process sends the MPT end level command to the temperature controller, and can
monitor temperature feedback to maintain a Control Tolerance and a Dwell
Period.
If your configuration includes an additional analog input resource for an external
temperature conditioner, you can also set the Monitor Tolerance.
Note The Control Tolerance and Monitor Tolerance features require
independent feedback channels.
Note In most cases, Program with Feedback channels are configured as
low-rate channels.
Other controllers with
Program Only
If the programming channel is configured as Program Only, the process sends
the MPT end level command to the temperature controller, which maintains the
control loop. In this scenario, you cannot set a Control Tolerance, Monitor
Tolerance, or limits on temperature feedback.
Note In most cases, Program Only channels are configured as low-rate
channels.