Rockwell-automation 1771-OFE/B Analog Output Module User Manual Manuel d'utilisateur télécharger pdf (Page 30)

3-4

Publication 1771Ć6.5.30 - November 1998

Description

Decimal Bit

(Octal Bit)

Word

09 (11)

When set (1), indicates negative maximum scaling value for Channel 3. When

reset (0), indicates positive maximum scaling value for channel 3.

10 (12)

When set (1), indicates negative minimum scaling value for Channel 4. When

reset (0), indicates positive minimum scaling value for channel 4.

Word 5

continued

11 (13)

When set (1), indicates negative maximum scaling value for Channel 4. When

reset (0), indicates positive maximum scaling value for channel 4.

12Ć14 (14Ć16) Reserved

15 (17)

When set (1), tells the module to expect binary data. When reset (0), signifies

fourĆdigit BCD data.

At power-up, the module’s microprocessor assumes default

conditions of:

• positive data words

• no scaling

• BCD data

The module’s microprocessor receives these values if you do not

enter data into the configuration word:

The voltage or current value at one of the module’s outputs is

directly proportional to the value specified in that channel’s data

word. The output scale is divided into 4095 parts, which means that

as the data word is incremented or decremented, the output signal is

incremented or decremented 1/4095 of the full scale.

Table 3.B shows the incremented voltage or current assigned to each

bit for the four different output scales. For example, if the data word

for Channel 1 contains the value 0000 0111 1111 1111 (2047

decimal), the output for Channel 1 would be 2047/4095 or

approximately 1/2 of the full scale.

Table 3.B

Output Ranges and Resolution

Nominal Range Unscaled Code Range Actual Output Range

∆ V/Bit or ∆ I/Bit

1 to 5 volts 0 to 4095 1 to 5.00V +0.1% 0.976 mV/Bit

0 to 10 volts 0 to 4095 0 to 10.00V +0.1% 2.44 mV/Bit

Ć10 to +10 volts Ć4095 to +4095 Ć10 to +10.00V +0.1% 4.88 mV/Bit

4to20mA 0 to 4095 4 to 20.00 mA +0.1% 0.0039 mA/Bit

0to50mA 0 to 4095 0 to 50.00 mA +0.1% 0.0122 mA/Bit

Default Configuration

Data Format

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 83 84

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