3.3 Setting Output Specifications
E5CK
3--5
3.3 Setting Output Specifications
•
Eight output are supported :
control output (heat)
control output (cool)
alarm outputs 1 to 3
LBA, and
error 1 (input error)
error 2 (A/D converter error).
These functions are assigned to control outputs 1 and 2, and auxiliary
output 1.
•
Restrictions on assignment destination are placed on some of the out-
puts. The following table shows where outputs may be assigned to.
Assignment
Destination
Control Output
Auxiliary Output
Destination
Output Function
1
2
1
Control output (heat)
F
F
Control output (cool)
F
F
Alarm 1
F
F
F
Alarm 2
F
F
F
Alarm 3
F
F
F
LBA
F
F
F
Error 1; Input error
F
Error 2; A/D converter error
F
With control output (cool) the conditions for switching from standard
control to heating and cooling control are reached when the output
function is assigned at the cooling side during heating and cooling
control.
In other words, heating and cooling control is carried out when control
output (cool) is assigned, and standard control is carried out when out-
put is not assigned. For details on heating and cooling control, see 4.1
Selecting the Control Method (page 4-2).
•
The same output function can not be assigned to a single destination
more than once.
•
Factory settings are as follows:
Control output (heat) = control output 1
Alarm 1 = control output 2
Alarm 2 = auxiliary output 1.
•
Output assignments are set in the “control output 1 assignment”, “con-
trol output 2 assignment” and “aux output 1 assignment” parameters
(setup mode).
•
“Direct operation” (or normal operation) refers to control where the
manipulated variable is increased according to the increase in the pro-
cess value. Alternatively, “reverse operation” refers to control where the
manipulated variable is decreased according to the decrease in the pro-
cess value.
For example, when the process value (PV), is lower than the set point
(SP), in a heating control system, the manipulated variable increases by
the difference between the PV and SP values.
Accordingly, this becomes “reverse operation” in a heating control system.
Alternatively, this becomes “direct operation” in a cooling control system.
•
Direct/reverse operation is set in the [
]“direct/reverse operation”
parameter (setup mode).
J
Output assign-
ments
J
Direct/reverse
operation
