Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 236)

9-3
IM 04L31A01-17E
9
Green Series Communications
External Loop Setting (Tuning Setting) Display
You can set up to 21 turning parameters.
• When the connecting model is UT Series
• Select the turning parameters from below. Item ID is indicated inside the
parentheses.
Target setpoint (SP), alarm value 1 (A1), alarm value 2 (A2), alarm value 3
(A3), alarm value 4 (A4), proportional band (P), integral time (I), derivative time
(D), output high-limit (OH), output low-limit (OL), manual reset (MR), relay
hysteresis (H), control direction (DR), dead band (DB), preset output (PO), and
others (ETC)
• If you select an item ID from “SP, A1, A2, A3, A4, P, I, D, OH, OL, MR, H, DR,
DB, and PO,” the preset setup information is assigned to the detail information
items (item name, register address, decimal point position, high and low limits
of the value range). If the item ID is “ETC,” use the operation key to enter the
values.
• If [Auto setting] is executed, the detail information (such as the register
address) of each tuning parameter is set automatically according to the various
information that was read automatically on the External loop setting (Basic
setting) display. The register addresses are set automatically also by
executing [Auto reading] on the External loop setting (Basic setting) display.
• When the connecting model is “ETC”
The item ID is fixed to ETC (others). Set the detail information items (item name,
register address, decimal point position, and high and low limits of the value range)
using the operation keys.
Limitations
• The control from the CX to the UT series may not work precisely, if the UT series
model is set as follows.
When control mode switching (manual/auto/cascade switching, remote/local
switching, or run start/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).
9.1 Specifications of the Green Series Communication Function