Rockwell-automation 1746-NO8V SLC 500 8-Point Analog Output Module/ Us Uživatelský manuál stáhnout pdf (Strana 42)

Publication 1746-UM026A-EN-P - September 2003

4-18 Configuring the Module

EXAMPLE 5: Set Preset Fault Values

Suppose you have a valve connected to Channel 7 with a 4 to 20

mA operating range and you want to use Engineering Units format.

You would use the following bit settings for the Channel 7

configuration word:

Suppose, also, that you would like the output to go to 12 mA if a

fault condition occurred. You would enter the following for Channel

7 data parameter 1. (Note that data parameter 2 is not used for the

Preset Fault Value.)

O:e.23 12000 (decimal) Channel 7 data parameter 1

Now set the bits in the Channel 7 configuration word:

Monitor bit 4 of Channel 7 Input Status Word 2 (I:e.15). When this

bit is a 1 (Preset Fault Value set), then set the Channel 7

configuration back to its original value with the addition of setting

the Channel 7 configuration word to Preset Output on Fault (bit 13):

If a fault is detected, then the output for Channel 7 will go to 12

mA.

Address 15 Channel 7 Configuration Word 0

O:e.15 0000 000 0 0001 0011

Address 15 Channel 7 Configuration Word 0

O:e.15 0000 1011 0001 0011

Address 15 Channel 0 Configuration Word 0

O:e.15 0010 0000 0001 0011

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 73 74

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Rockwell-automation 1746-NO8V SLC 500 8-Point Analog Output Module/ Us Uživatelský manuál Strana 42