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4 2 Second Set Point
4 2 Second Set Point
In certain applications it is desirable to change the set point automatically
without the need to adjust the set point. You can apply a signal to event input
terminals ( pin 17 and pin 16 ).The signal applied to the event input may come
from a
, a
, an
, a
or other device. Select
SP2 for EIFN which is contained in the setup menu.
This is available only in a case that SP1.2, MIN.R or HR.R is used for SPMD,
where MIN.R and HR.R are used for the ramping function.
See
Timer
PLC
Alarm Relay
Manual Switch
Section 4-4.
In certain applications it is desirable to change the set point automatically
without the need to adjust the set point. You can apply a signal to event input
terminals ( pin 17 and pin 16 ).The signal applied to the event input may come
from a
, a
, an
, a
or other device. Select
SP2 for EIFN which is contained in the setup menu.
This is available only in a case that SP1.2, MIN.R or HR.R is used for SPMD,
where MIN.R and HR.R are used for the ramping function.
See
Timer
PLC
Alarm Relay
Manual Switch
Section 4-4.
Application 1: A process requires being heated to a higher temperature as
soon as its pressure exceeds a certain limit. Set SPMD=SP1.2, EIFN=SP2 ( or
SP.P2 if the second PID is required for the higher temperature too ).
The pressure gauge is switched ON as it senses a higher pressure. Connect
the output contacts of the pressure gauge to the event input. SP1 is set with a
normal temperature and SP2 is set with a higher temperature. Choose ACTU
for SP2F.
Application 1: A process requires being heated to a higher temperature as
soon as its pressure exceeds a certain limit. Set SPMD=SP1.2, EIFN=SP2 ( or
SP.P2 if the second PID is required for the higher temperature too ).
The pressure gauge is switched ON as it senses a higher pressure. Connect
the output contacts of the pressure gauge to the event input. SP1 is set with a
normal temperature and SP2 is set with a higher temperature. Choose ACTU
for SP2F.
Application 2: An oven is required to be heated at 300 °C from eight o'clock
AM to six o'clock PM. After six o'clock PM it is desirable to be maintained at
80 °C. Use a programmable 24 hours cycle timer for this purpose. The timer
output is used to control event input. Set SPMD=SP1.2, and EIFN=SP2 ( or
SP.P2 if the second PID is required to be used for the second set point ).
Application 2: An oven is required to be heated at 300 °C from eight o'clock
AM to six o'clock PM. After six o'clock PM it is desirable to be maintained at
80 °C. Use a programmable 24 hours cycle timer for this purpose. The timer
output is used to control event input. Set SPMD=SP1.2, and EIFN=SP2 ( or
SP.P2 if the second PID is required to be used for the second set point ).
Event input +
Event input
Event input +
Event input
17
16
Apply Signal To
Apply Signal To
Setup
EIFN choose SP2 or SP.P2
EIFN choose SP2 or SP.P2
Availability
SPMD choose
SPMD choose
or
or
SP2F Function: Define format of SP2 value . If SP2F in the setup menu is
selected with ACTU, the event input function will use SP2 value for its second
set point. If SP2F is selected with DEVI, the SP1 value will be added to SP2.
The sum of SP1 and SP2 (SP1+SP2) will be used by the event input function
for the second set point value. In certain applications it is necessary to move
the second set point value with respect to the set point 1 value. The
DEVI(deviation) function for SP2 proves to be a powerful tool in this case.
SP2F Function: Define format of SP2 value . If SP2F in the setup menu is
selected with ACTU, the event input function will use SP2 value for its second
set point. If SP2F is selected with DEVI, the SP1 value will be added to SP2.
The sum of SP1 and SP2 (SP1+SP2) will be used by the event input function
for the second set point value. In certain applications it is necessary to move
the second set point value with respect to the set point 1 value. The
DEVI(deviation) function for SP2 proves to be a powerful tool in this case.
SP2F=Format of SP2 Value
ACTU: SP2 is an actual value
DEVI: SP2 is a deviation value
SP2F=Format of SP2 Value
ACTU: SP2 is an actual value
DEVI: SP2 is a deviation value
SP1 is set with 300 °C and SP2 is set with 80 °C. Choose ACTU for SP2F. After
six o'clock PM the timer output is closed. The event input function will select
SP2 ( =80 °C) to control the process.
SP1 is set with 300 °C and SP2 is set with 80 °C. Choose ACTU for SP2F. After
six o'clock PM the timer output is closed. The event input function will select
SP2 ( =80 °C) to control the process.
Refer to
for more descriptions about
function.
Section 4-1
SP2F
Refer to
for more descriptions about
function.
Section 4-1
SP2F
Format of SP2 Value
SP2F choose
Format of SP2 Value
SP2F choose
Actual Value
Actual Value
or
Deviation Value
or
Deviation Value
