Specifications – Rockwell Automation 1771-CFM Config. Flowmeter Installation Instructions User Manual

Page 18

Configurable Flowmeter Module

Publication 1771ĆIN043B-EN-P - July 2002

Number ofInput Channels

Module Location

1771ĆA1B, ĆA2B, A3B, ĆA3B1, ĆA4B (series A and B) I/O chassis

1771ĆAM1, ĆAM2 I/O chassis with integral power supply, adapter

Maximum Count Value

0-9,999,999 (programmable)

BTW Processing Time (worst case)

5.5ms Ċ on a configuration change

Module Scan Time

1.3-5ms (depending on configuration and frequency)

Maximum Input Frequency

100kHz @ flowmeter Input (maximum frequency is 120kHz Ć

100kHz @ gate input overrange occurs at 100kHz)

Inputs per Channel

2 - flowmeter input Ċ used for all modes

gate input Ċ

used in Totalizer and Nonresettable Totalizer modes

Flowmeter (F0-F3) Input Voltage

50mVĆ30V ac Ċ Magnetic Pickup

5Ć30V dc (TTL compatible)

Bently 3300 5 & 8 mm Ċ Proximity Pickups

Flowmeter (F0-F3) Input Impedance

5KΩ ± 30% resistive

Gate (G0-G3) Voltage

5-12 and 12-30V dc

Gate (G0-G3) Current

22mA maximum

Number ofOutputs

Maximum Output OffĆstate Leakage Current

less than 300μA @ 30V dc

Maximum OnĆstate Voltage Drop

0.6Ω x current

Output Control

Any number ofoutputs are assignable to any of4 channels.

One turn-on" value and one turn-off" value per output.

Output Voltage

5 to 30V dc, customer supplied

Output Current

1A per channel sourced out ofmodule

All outputs can be on simultaneously without derating.

Output Switching Time

outputs triggered by Total: turn ON < 100μs; turn OFF < 100μs

all other turn ON and OFF times < 1ms

Filtering (F0ĆF3 inputs)

Ċ jumper selectable

highĆspeed or lowĆpass filter jumper (filter = below 70Hz)

Debouncing (G0ĆG3 inputs)

Ċ software selectable

1s (approximate) between transitions with no minimum pulse width Ċ

Totalizer and Nonresettable Totalizer modes only

Module dc Source Output

24V dc; 12mA; ripple: ±5%; noise: 240mV peakĆtoĆpeak

Backplane Current

0.8A maximum, 5V dc

Customer Supply

5 to 30V dc

Isolation Voltage

Tested to withstand - for 60s

500V between input and backplane,

1500V between output and backplane,

500V between isolated channels,

1500V between isolated outputs and gates

Module Power Dissipation

13W (maximum); 2W (minimum)

Module Thermal Dissipation

54.2 BTU/hr (maximum); 6.8 BTU/hr (minimum)

Maximum Adjacent Slot Power Dissipation

11W

Input Conductors

Wire Type