GRAPHTEC GL840 - External Input;Output Functions

4-9
CHAPTER 4 Specication
External Input/Output Functions
Item Description
Input/output types • Trigger input (1 ch) or External sampling input (1 ch)
• Logic input (4 ch) or Pulse input (4 ch)
• Alarm output (4 ch)
* Switch between Logic and Pulse
* Switch between Trigger and External sampling.
* The Input/output cable for GL B-513 (option) is required to use the external output
function.
Input specications Input voltage range : 0 to +24 V (single-ended ground input)
Input signal : No-voltage contact (a-contact, b-contact, NO, NC),
Open collector, Voltage input
Input threshold voltage : Approx. +2.5 V
Hysteresis : Approx. 0.5 V (+2.5 to + 3 V)
* Refer to "2.6 Logic Alarm Cable Connection and Functions" for details on the input
circuit.
Alarm output specications Output format: Open collector output (5 V, pull-up resistance 10KΩ)
<Maximum ratings of output transistor>
• Collector-GND voltage : 30 V
• Collector current : 0.5 A
• Collector dissipation : 0.2 W
* Refer to "2.6 Logic Alarm Cable Connection and Functions" for details on the
output circuit.
Output conditions: Level judgment, window judgment, logic pattern judgment, pulse
judgment
Pulse input Revolutions mode (engines, etc.)
Function : This mode counts the number of pulses per sampling interval, and
then converts them by multiplying the scaling factor to the RPM.
Settable the number of pulses per revolution during revolution
Spans : 50, 500, 5000, 50 k, 500 k, 5 M, 50 M, 500 M PRM/F.S.
Counts mode (electric meters, etc.)
Function : Displays a count of the number of pulses for each sampling interval
from the start of measurement.
Spans : 50, 500, 5000, 50 k, 500 k, 5 M, 50 M, 500 M C/F.S.
Inst. mode
Function : Counts the number of pulses for each sampling interval.
Resets the count value after each sampling interval.
Spans : 50, 500, 5000, 50 k, 500 k, 5 M, 50 M, 500 M C/F.S.
Maximum number of pulse inputs
Maximum input frequency : 50kHz
Maximum number of count : 50kC/sampling (16-bit counter)
Connectable sensor, terminal, adapter
(Generic name: GS sensor and
terminal/adapter)
Number of GS sensors and terminals/adapter connection terminals: 1
GS-TH: Temperature and humidity sensor
GS-4TSR: 4CH thermistor terminal
GS-LXUV: Illuminance / ultraviolet sensor
GS-DPA: Branch adapter for GS
GS-DPA-AC: Adapter for AC current sensor
GS-CO2: CO2 sensor
GS-3AT: 3-axis acceleration / temperature sensor
GS-4VT: 4CH voltage / temperature terminal
* The items above are optional accessories.
Sampling: 500 ms to 1 hour
* Specic setting is not required. It is synchronized to the setting of the GL840.