GRAPHTEC GL820 - External Input;Output Functions

4−6
CHAPTER 4 Specifications
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 logic alarm cable B-513 (option) is required to use the external output
function.
Input specifications 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 page 2-8 for details on the input circuit.
Alarm output specifications Output format: Open collector output (5 V, pull-up resistance 10 KΩ)
<Maximum ratings of output transistor>
• Collector-GND voltage : 30 V
• Collector current : 0.5 A
• Collector dissipation : 0.2 W
* Refer to page 2-8 for details on the output circuit.
Output conditions: Level judgment, window judgment, logic pattern judgment,
pulse judgment
Pulse input Revolutions mode (engines, etc.)
• Function : Counts the number of pulses per second; enables them to
be converted to rpms.
• 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)