Sony LT10 Series - 6-2. I;O circuitry

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6-2. I/O circuitry
Output circuit (Pins 2-7) : Open collector output
Go/No Go output
High: displayed value > upper limit → “L” (ON)
Go : upper limit > displayed value > lower limit → “L” (ON)
Low : lower limit > displayed value → “L” (ON)
Note
All terminals are “H” (OFF) when an alarm is set.
Start/hold input
•
When the peak-hold function has been chosen an “L” (ON)
signal sets the maximum, minimum, and peak-to-peak values
to the current value and restart their storing. (Start function)
• The start function results when the initial setting is
changed from
, set at the time of shipping, to .
When in the measuring mode for the current value, an “L”
(ON) signal will hold the output (terminals) and display of
the Go/No Go comparison result. (Hold function)
Note
While the Go/No Go output is at the “L” level, reset/recall
cannot be effected by reset key or external reset/recall input.
Reset/recall input
“L” (ON) sets the measured value to zero.
When there is a preset value this is recalled.
Note
Even when the “L” level is held, the Go/No Go output
(terminals) and the display are not held.
Main DC power (12 to 24V)
Use with the pin !£ GND.
Connect to a 12 to 24V DC power source.
• Use a switching diode with a back-voltage of
approximately 3 times the supply voltage (+COM) (80 V
back-withstand voltage with a supply voltage of 24 V).
Output signal rating
On : V
OL
= MAX. 0.7 V (when output current I
OL
= 24 mA)
Off : V
OH
= MAX. 26.4 V (output current I
OH
= MAX. 250 µA)
Note
When connecting an L (coil) load such as a relay to output pins, be
sure to connect a back-voltage absorption diode in parallel with the
coil. Otherwise, the transistors inside the output IC may be damaged.
Display unit
GND
OUT IN
+COM
–COM
74LS06
Go/No Go output
Externally connected device (Connection Type 1)
Relay
GND
OUT IN
+COM
–COM
74LS06
Display unit
Externally connected device (Connection Type 2)
Go/No Go output