Rockwell-automation 1794-OF4I FLEX I/O Isolated Analog Output Module I Manuale Utente Scaricare il pdf (Pagina 4)

4 FLEX™ I/O Isolated Output Analog Module

Publication 1794-IN037E-EN-P - November 2011

Status Indicator

The OK status indicator is two-colored: red and green. The indicator flashes green

for one of three reasons:

1. The module configuration word is zero (for example, power up reset

condition).

2. The 24V DC user power is off.

3. The module is in configuration mode.

The indicator displays red to indicate that the module did not pass the initial

hardware test. Cycle power again.

After power up, if the status indicator is not flashing green or solid green, cycle

module power once more to verify a proper reset of the bus interface.

Specifications

Output Map

Dec 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Oct 17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0

Word 0 EN S1 S0 0 0 0 0 0 0 0 0 0 0 0 0 0

Word 1 Output data channel 0

Word 2 Output data channel 1

Word 3 Output data channel 2

Word 4 Output data channel 3

Word 5 Ch 3 configuration Ch 2 configuration Ch 1 configuration Ch 0 configuration

Word 6 IC 1 TR IT Q3 Q2 Q1 Q0 RV QK CK GO Channel number

Where: EN = Inable output; 0 = Output follows S1/S0, 1 = Output enabled

S1/S0 = Safe state source

IC = Initiate configuration bit

TR = Transparent bit

IT = Interrupt toggle bit

Q0…Q3 = Requests for outputs to hold

RV = Revert to default bit

QK = Quick calibration

CK = Calibration clock

GO = Gain offset select

Configure the Output Channels

Configuration Bits Nominal Range Data Type Output Values Module Update

Rate

MSD LSD

0 0 0 1 4...20 mA Signed 2’s

complement

<0000…7878> 5.0 ms

0 0 1 0 ±10V <831F…7CE1> 2.5 ms

0 0 1 1 ±5V <8618…79E8> 2.5 ms

0 1 0 0 0...20 mA Signed 2’s

complement %

0…10000> 5.0 ms

0 1 0 1 4…20 mA <0…10000> 5.0 ms

0 1 1 0 0…10V 0…10000 5.0 ms

0 1 1 1 ±10V <-10000…10000> 5.0 ms

1 0 0 0 0…20 mA Binary 0000…F3CF 2.5 ms

1 0 0 1 4…20 mA 0000…F0F1 5.0 ms

1 0 1 0 0…10V 0000…F9C2 2.5 ms

1 0 1 1 0…5V 0000…F3CF 2.5 ms

1 1 0 0 0…20 mA Offset binary <0618…F9E8> 2.5 ms

1 1 0 1 4…20 mA <8000…F878> 5.0 ms

1 1 1 0 ±10V <031F…FCE1> 2.5 ms

1 1 1 1 ±5V <0618…F9E8> 2.5 ms

General Specifications

Attribute Value

Number of outputs 4 isolated

Module location 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN

FlexBus voltage 5V DC

FlexBus current 50 mA

External DC power supply,

nom voltage range

24V DC

19.2…31.2V DC (includes 5% AC ripple)

External DC power supply

current

210 mA @ 24V DC

Thermal dissipation, max 16 BTU/hr @ 31.2V DC

Power dissipation, max 4.7 W @ 31.2V DC

Isolation voltage 120V (continuous), Basic Insulation Type, channel to channel, channel to user,

channel to system, and user power to system when used with 1794-TB2,

1794-TB3, 1794-TB3S, 1794-TB3T, or 1794-TB3TS.

250V (continuous), Basic Insulation Type, channel to channel, channel to user,

channel to system, and user power to system when used with 1794-TBN.

Type tested at 1000V AC for 60 s.

Data format 2’s complement

2’s complement %

Binary

Offset binary

Indicators 1 red/green power/status indicator

Keyswitch position 4

Dimensions, with module

installed in base; HxWxD

94.0 x 94.0 x 66.0 mm

(3.7 x 3.7 x 2.6 in.)

Conductor category

(1)

2 – on signal ports

2 – on power ports

Conductor wire size Determined by installed terminal base

Wire type Shielded on signal ports

North American temp code T4A

IEC temp code T4

(1)

Use this conductor category information for planning conductor routing. Refer to Industrial Automation Wiring and

Grounding Guidelines, publication 1770-4.1

Module Specifications – 1794-OF4I

Attribute Value

Resolution

Voltage

Current

15 bits plus sign

0.320 mV/cnt

0.656 mA/cnt

Conversion type Digital-to-analog converter

Update rate 2.5/5.0 ms all channels (see Configure the Output Channels

table)

Output current terminal 0 mA output until module is configured

4…20 mA (user configurable)

0…20 mA (user configurable)

Output voltage terminal 0V output until module is configured

±10V (user configurable)

0…10V (user configurable)

±5V (user configurable)

0…5V (user configurable)

Step response to 63% of full

scale

< 25 s

Current load on voltage

output, max

3 mA

Resistive load on voltage

output

0…750 

Absolute accuracy

Voltage terminal

Current terminal



0.1% full scale @ 25 °C

0.1% full scale @ 25 °C

Accuracy drift w/temperature

Voltage terminal

Current terminal



0.0012% full scale/°C

0.0025% full scale/°C

Calibration Factory calibrated; can be recalibrated when necessary.

Maximum overload 30V continuous or 32 mA continuous, one channel at a time.

Environmental Specifications

Attribute Value

Temperature, operating IEC 60068-2-1 (Test Ad, Operating Cold),

IEC 60068-2-2 (Test Bd, Operating Dry Heat),

IEC 60068-2-14 (Test Nb, Operating Thermal Shock):

-20…55 °C (-4…131 °F)

Temperature, surrounding air,

max.

55 °C (131 °F)

Temperature, nonoperating IEC 60068-2-1 (Test Ab, Unpackaged Nonoperating Cold),

IEC 60068-2-2 (Test Bb, Unpackaged Nonoperating Dry Heat),

IEC 60068-2-14 (Test Na, Unpackaged Nonoperating Thermal Shock):

-40…85 °C (-40…185 °F)

Relative humidity IEC 60068-2-30 (Test Db, Unpackaged Damp Heat):

5…95% noncondensing

Vibration IEC60068-2-6 (Test Fc, Operating):

5 g @ 10…500 Hz

Shock, operating IEC60068-2-27 (Test Ea, Unpackaged shock):

30 g

Shock, nonoperating IEC60068-2-27 (Test Ea, Unpackaged shock):

50 g

Emissions CISPR 11:

Group 1, Class A (with appropriate enclosure)

ESD immunity IEC 61000-4-2:

6 kV contact discharges

8 kV air discharges

General Specifications

1 2 3 4 5

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