Azbil SDC35 - Page 83

5-23
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION

Zone PID
In the PID fixed control, the PID group auto change function by the SP or PV can
be selected.
Item (Bank) Display Contents Initial value User level
zone PID operation
(Setup bank)
0: Disabled.
1: Changed by SP.
2: Changed by PV.
0 High function
Zone 1 (Zone bank)
–1999 to +9999U 9999U High function
Zone 2 (Zone bank)
9999U
Zone 3 (Zone bank)
9999U
Zone 4 (Zone bank)
9999U
Zone 5 (Zone bank)
9999U
Zone 6 (Zone bank)
9999U
Zone 7 (Zone bank)
9999U
Zone hysteresis
(Zone bank)
0 to 9999U 5U
• When the PID fixed control (
CtrL
=1) is used, the display and setting can be
performed.
• When [
C24
: Zone PID operation] is set at “0: Disabled.”, the PID group setting of
the SP bank becomes valid.
• When the zone PID operation is set at “Enabled.” (
C24
=1 or 2), the PID group
setting of the SP bank becomes invalid and the PID group is automatically
changed as described in the following. Additionally, a hysteresis can be set so that
the PID group is not changed frequently by a small change of the PV or SP at a
position close to the zone set value.
Zone 7
PID 8 group
PV
PID group zone change by PV
PID 7 group
PID 6 group
PID 5 group
PID 4 group
PID 3 group
PID 2 group
PID 1 group
PID 8 group
PID 7 group
PID 6 group
PID 5 group
PID 4 group
PID 3 group
PID 2 group
PID 1 group
Zone 6
Zone 5
Zone 4
Zone 3
Zone 2
Zone 1
Zone 7
Zone 6
Zone 5
Zone 4
Zone 3
Zone 2
Zone 1
SP
PID group zone change by SP
• Operation at a changeover point between zones is as shown below.
As an example, the change between PID1 and PID2 is shown.
Shows that the PID group changes at this value.
Shows that the PID group changes at the point
where 1U is added to this value.
Zone 1 setpoint
PID2
PID1
Hysteresis for zone