Yamatake SDC35, User Manual

Page: 81 / 280

5-23
• Priorities for PID group change
Priorities for PID group change are shown below.
Handling Precautions
• If PID group change is used for an internal contact (DI), zone PID
does not function. When zone PID is used, do not use PID group
change by selecting PID group selection as the function of an internal
contact (DI).
• The SDC25/26 does not have an RSP (remote SP) function or zone
function.
■
Zone PID
In the PID fixed control, the PID group auto change function by the SP or PV can
be selected.
• 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.
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
DI function
When PID group
change is
selected.
Zone function
During use
Priority
High Low
During RSP
[SP group linked]
[RSP dedicated
group selectable]
SP group
assignment of
PID group > > >
Item (Bank) Display Contents Initial value User level
Zone 4 (Zone bank) 9999U
Zone 5 (Zone bank) 9999U
Zone 6 (Zone bank) 9999U
Zone 7 (Zone bank) 9999U
Zone hysteresis
(Zone bank) 0 to 9999U 5U
zone PID operation
(Setup bank) 0: Disabled.
1: Changed by SP.
2: Changed by PV. 0 High function
Zone 1 (Zone bank) –1999 to +9999U 9999U
Zone 2 (Zone bank)
High function
Zone 3 (Zone bank) 9999U
9999U