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GRT1-CT1(-1) Counter Units Section 7-4
7-4 GRT1-CT1(-1) Counter Units
This section describes the GRT1-CT1 and GRT1-CT1-1 Counter Units.
7-4-1 Specifications
General Specifications
Performance Specifications
Note The response time is the time between the moment the A, B, Z, or IN input
turns ON or OFF and the moment the digital output is updated to the new
state. The specified response time may not be achieved during monitoring or
maintenance.
I/O Signal Specifications
The encoder A and B inputs are phase differential signals for counting. The
encoder Z input is a zero marker each revolution.
Inputs Encoder A and B Inputs
Item Specification
Unit power supply voltage 24 VDC (20.4 to 26.4 VDC)
I/O power supply voltage 24 VDC (20.4 to 26.4 VDC)
Noise immunity Conforms to IEC 61000-4-4, 2.0 kV (power lines)
Vibration resistance
10 to 60 Hz, 0.7-mm double amplitude; 60 to 150 Hz, 50 m/s
2
Shock resistance
150 m/s
2
Dielectric strength 500 VAC (between isolated circuits)
Insulation resistance 20 MΩ minimum (between isolated circuits)
Ambient operating temperature −10 to 55°C (with no icing or condensation)
Ambient operating humidity 25% to 85%
Operating environment No corrosive gases
Ambient storage temperature −25 to 65°C (with no icing or condensation)
Mounting 35-mm DIN Track mounting
Item Specification
Input points 2 counter inputs (A and B) and 1 settable input (Z input or digital input)
Output points 1 digital output (settable)
Counter resolution 32-bit
Maximum counter input fre-
quency
60 kHz max. depending on the counter mode. Refer to I/O Signal Specifications on
page 235 for details.
Overall response time 1 ms max. (See note.)
Isolation method Photocoupler isolation between communications lines and inputs/output lines.
No isolation between inputs signal lines and output signal lines.
I/O connection method Screwless Terminal block
Item Specification
Model GRT1-CT1 GRT1-CT1-1
Input type NPN PNP
Number of inputs 2 (A and B encoder inputs)
ON voltage 18.6 V min. (between input
terminal and V)
18.6 V min. (between input
terminal and G)
ON current 3.0 mA min.
OFF voltage 4.0 V max. (between input
terminal and V)
4.0 V max. (between input
terminal and G)
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