6.
External Control Function
6.1. Each External Control Terminal
Internal circuit: pull-up at approx. 5 V (resistance value: approx. 10 k
Ω
)
Control signal HI level: 4.2 to 5 V with respect to terminal COM
Control signal LO level: 0 to 0.4 V with respect to terminal COM
Caution:The COM terminal of the external control circuit and the LO
terminal of the input circuit have the same potential in terms of
direct current.
6.2. Pattern Select Function
The pattern select function allows scaling data and comparator
data to be stored in a maximum of eight patterns and lets you set
any pattern for use. Pattern select control is achieved by terminal
control and front panel key-based operation, depending on
condition data setting. For terminal control, short circuiting the
P.SEL1 to P.SEL3 terminals with the terminal COM, or making
these terminals have the same potential, allows P-1 and up to P-8
to be switched. Also, for front panel key-based operation, pressing
the Increment key for approx. 3 seconds allows a pattern to be
switched.
* In default, front panel key-based operation is enabled. If you wish to
perform terminal control, set it up using condition data.
6.3. Start/Hold Function
The start/hold function holds the display at any timing, which can be
set in type A or type B using condition data. Type A is the free run
mode, in which you short the S/H terminal with terminal COM or make
these terminals have the same potential from the free-run status to
hold the indicated value and comparison judgment value. Type B is
the one-shot mode. In this mode, you short the S/H terminal with
terminal COM or make these terminals have the same potential from a
hold status to output the indicated value and comparison judgment
value once. For this, see the timing chart below.
6.4. Peak Hold Function
The peak hold function holds one of the maximum values (peak
hold), minimum values (valley hold), and maximum value - minimum
value - (peak valley hold) and produces output in relation to it
(switching of these values is set up using condition data). The peak
hold function can be activated by shorting the PH terminal with the
terminal COM or making these terminals have the same potential.
6.5. Digital Zero Function
The digital zero function regards display at any timing as zero and
indicates varying width from this point on. This function can be
activated or deactivated by terminal control or front panel key-based
operation, which is selected according to the setting of condition data.
For terminal control, the DZ and COM terminals are short-circuited or
made to have the same potential to activate the digital zero function,
causing the display of that time to be zero. For front panel key-based
operation, press the Shift key for approx. 3 seconds to activate the
function, causing the display of that time to be zero.
* In the default, front panel key-based operation is enabled. To
perform terminal control, set it up using condition data.
7.
Output Function
7.1. Comparison Output Function
The A7000 series allows four judgment values of HH, HI, LO, and
LL to be set up with respect to the measured value (indicated value)
and the judgment result to be output by relay contact output or
photocoupler (when the comparison output unit has been installed).
For the contact rating, etc., see the output specifications.
7.2. BCD Output Function
The A7000 series can output BCD signals with respect to the
indicated value (when the BCD output unit has been installed). BCD
output logic can be selected using condition data.
7.3. Analog Output Function
The A7000 series can output an analog signal with respect to the
indicated value (when the analog output unit has been installed).
There are four types of outputs: 0 to 1 V, 0 to 10 V, 1 to 5 V, and 4 to
20 mA, which can be selected using scaling data. Also, any scaling
can be applied.
7.4. RS-232C Function
The A7000 series allows RS-232C function to be incorporated
(when the RS-232C unit has been installed). For the RS-232C function,
see the separate Communications Function Operation Manual.
7.5. RS-485 Function
The A7000 series allows RS-485 function to be incorporated (when
the RS-485 unit has been installed). For the RS-485 function, see the
separate Communications Function Operation Manual.
P.SEL1
P.SEL2
P.SEL3
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6 Pattern 7 Pattern 8
Open
Open
Shorted
Shorted
Open
Open
Shorted
Open
Shorted
Open
Shorted
Shorted
Open
Shorted
Open
Shorted
Terminal
Name
Instruction Manual for MODEL A7X18-X(Temperature Measurement) 9/12
