Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 257)

9-24
IM 04L31A01-17E
9.8 Starting the Operation
Note
Start the operation after completing the following settings and checking the operating conditions
of the Green Series communication function (see section 9.7).
1. The serial interface and Modbus master settings must be ready Set the serial interface and the
Modbus master function and save the settings by pressing the [End] soft key on the basic
setting menu.
2. After step 1, set the parameters related to external loops according to Basic setting (section
9.3), Parameter address setting (section 9.4), and Tuning setting (section 9.5).
Starting the Operation
Power cycle the CX and the connecting models.
Switching the Operation Mode (RUN/STOP)
If you change the operation mode on the CX, the operation mode on the connecting
models also changes.
Limitations
• The control from the CX to the UT series may not work precisely, if the UT series
model is set as follows. When using the Green series communication function of
the CX, it is recommended that the UT series not be set as follows.
When control mode switching (auto/manual/cascade switching, remote/local
switching, or run/stop switching) or target setpoint number switching is enabled
using external contact input.
• When the connecting model is UT series, the CX also performs a range check on
the UT parameters that can be changed on the control group display, control
overview display, and tuning display. However, for the following parameters, the
CX cannot perform the same checks that the UT performs, because the CX does
not have the relevant setup information.
•
When set to SP, the CX cannot perform a range check on SPH (SP high-limit)
and SPL (SP low-limit). The UT320, UT321, UT350, and UT351 cannot
perform these range checks either.
• The CX cannot check whether OH (output high-limit) is greater than OL (output
low-limit) of the PID parameter. The UT320, UT321, UT350, and UT351 do
not perform these checks either.
• The PID group number is 1 to 4 on the UT320, UT321, UT350, and UT351; it is
1 to 8 on other UTs. Even if you change the PID group on the UT side, the
change is not passed on to the CX.
• When set to manual output, the CX cannot perform a range check on OTH
(output high-limit) and OTL (output low-limit).