Digital Communications
The units can be equipped with an RS-485 or RS-232 interface card to provide digital communications. By
using shielded twisted pair wire, at most 247 units can be connected together via an RS-485 interface to a host
computer. An industry standard Modbus RTU is used for the communication protocol.
5
Fast Sampling Rate
The sampling rate of the input A to D converter reaches 5 times/second. This fast sampling rate allows this series to
control fast processes.
Smarter Logic Control
The function of Smarter Logic control is to automatically adjust the PID parameters from time to time. These dynamic
adjustments are made in order to tune the output value to be more flexible and adaptive to various processes. The
result is to enable a process to reach a predetermined set point in the shortest possible time with minimum overshoot
and/or undershoot during power-up or external load disturbance.
Programming Port
A programming port is used to connect the unit to a hand-held programmer or a PC for quick configuration.
Additionally, it can be connected to an Automatic Test Equipment (ATE) system for automatic testing & calibration.
Auto-tune
The auto-tune function allows the user to simplify the initial setup for a new system. A clever algorithm is provided to
obtain an optimal set of control parameters for the process. The Auto-tune feature can be applied either as the
process is warming up (cold start) or as the process is in a steady state (warm start).
Lockout Protection
In order to meet various security requirements, one of four lockout levels can be selected to prevent the unit from
being changed without authorization.
Bumpless Transfer
The Bumpless Transfer feature is a unique process protection feature that is employed upon a sensor break condition
or input problem. Bumpless transfer allows a controller to continue to proportion it’s output based on previous
process and control characteristics. Hence, the process can be temporarily controlled just as if running a closed
loop control application, making the severe problem of a Thermocouple error temporarily invisible. Bumpless transfer
is not to be used for an extended period time as in open loop control, run-away may occur.
Soft-start Ramp
The ramping function is performed during power up as well as any time the set point is changed. It ramp will control
both ramp up and/or ramp down. The process value will reach the set point with a predetermined constant rate.
Digital Filter
A first order low pass filter with a programmable time constant is used to improve the stability of process value. This
is particularly useful in certain applications where the process value is too unstable to be read.
Sel Function
The units have the flexibility for a user to select those parameters which are most significant and move these parameters
to the front of the display sequence. Up to 8 parameters may be selected to allow the user to build their own display
sequence.
