General specifications – Rockwell Automation 1771-CFM,D17716.5.99 CONFIGURABLE FLOWMET User Manual

Page 60

Specifications

A–2

Publication 1771Ć6.5.99 - December 1995

Number of Input 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

Input Voltage

50mVĆ200V ac peak Ċ Magnetic Pickup

5Ć40V dc (TTL compatible)

Bently 3300 5 & 8 mm Ċ Proximity Pickups

Input Impedance

Ω ±

30% resistive

Number of Outputs

Maximum Output OffĆstate Leakage Current

less than 300

A @ 40V dc

Maximum OnĆstate Voltage Drop

0.6

Ω

x current

Output Control

Any number of outputs are assignable to any of 4 channels.

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

Output Voltage

5 to 40V dc, customer supplied

Output Current

1A per channel sourced out of module

All outputs can be on simultaneously without derating.

Output Switching Time

outputs triggered by Total: turn ON < 100

s; turn OFF < 100

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

+24V dc Source

ripple:

5%; noise: 240mV peakĆtoĆpeak

Backplane Current

1A maximum

Isolation Voltage

500V between input and backplane

1500V between output and backplane

500V between isolated channels

1500V between isolated outputs and gates

Power Dissipation

13W (maximum); 2W (minimum)

Thermal Dissipation

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

Input Conductors

Wire Size