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<Toc>
7-4
<7. Function Block Diagram and Descriptions>
■ Selecting Program Pattern Using Contact Input
It is possible to select the program pattern by turning the four contact input signals ON or
OFF. This function is assigned to DI1 (contact input 1) to DI4 (contact input 4). Note that the
program pattern can be selected during RESET mode, can not during operation.
Contact
input
Program pattern number to be selected (PT.No)
1
2
3
4
5
6
7
9
8
10
11
12
13
14
15
DI1
ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON
DI2
OFF ON
DI3
OFF OFF OFF ON
DI4
OFF OFF OFF OFF OFF OFF OFF ON
ON OFF OFF ON
ON
ON
ON OFF OFF ON
ON OFF OFF ON
ON OFF OFF OFF OFF ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
For example, set contact input 2 (DI2) only to “ON” to change the program pattern 1 to the
program pattern 2.
Set contact input 1 (DI1) and contact input 2 (DI2) to “ON” to select the program pattern 3.
■ Switching Operation Mode Using Contact Input
Program operation for the selected program pattern starts when DI5 (contact input 5)
changes from OFF to ON.
Program operation stops when DI6 (contact input 6) changes from OFF to ON. Preset
output value is outputted when the operation stops.
Local-mode operation starts when DI7 (contact input 7) changes from OFF to ON.
Tracking switching function is assigned to DI7(contact input 7). Connect to contact output 3
(DO3) of the secondary-loop controller, since the cascade primary-loop control is used with
the cascade secondary-loop control.
If the operation of the secondary-loop controller changes from the cascade mode (to the
manual or automatic mode), the primary-loop controller stops its control computation and
outputs the input tracking signal as the manipulated output.
When the secondary-loop controller changes to the cascade mode, the contact signal from
the secondary-loop controller is turned off. And then, control computation restarts using the
tracking signal that was input just before the cascade mode is established as the initial
manipulated output value.
Status of DI7
Output tracking operation
ON
Tracking input signal is output as manipulated output signal of the primary-loop
controller.
OFF
Result of PID computation of the primary-loop controller is output.
■ PID
It is possible to use a maximum of eight groups of PID parameters.
Operating Parameters
Function
Parameter
Main menu
Submenu
Proportional band (P)
n.P
LP1
n.PID
Integral time (I)
n.I
LP1
n.PID
Derivative time (D)
n.D
LP1
n.PID
IM 05E01B02-42E
1st Edition : May 31,2000-00