Rockwell-automation 1746-NO8V SLC 500 8-Point Analog Output Module/ Us Uživatelský manuál stáhnout pdf (Strana 37)

Publication 1746-UM026A-EN-P - September 2003

Configuring the Module 4-13

Now set the bits in the Channel 0 configuration word to define the

user-scaling values.

Monitor bit 0 of Channel 0 Input Status Word 2 (I:e.8). When this bit

is 1 (user scaling values set), then set the Channel 0 configuration to

be User-Scaling.

When the user-defined scale values are set and the user-defined

scale data format is selected, the relationship between data value

(counts) and output signal is as follows:

Figure 4.3 Example relationship between output signal and channel data

Output Clamping

For added safety, the 1746-NO8I and 1746-NO8V output modules let

you define limits for the values in the output data words individually

for all eight channels. These data limits, in turn, limit the output

signals. When an output data word exceeds the data limit, the output

value is truncated to the limit.

You can use output data limiting to prevent PID loops from exceeding

safety limits, to prevent operators from inadvertently setting incorrect

values, etc.

The low clamping limit (Output Data Parameter 1) is the value which

the output signal will not go below. The high clamping limit (Output

Data Parameter 2) is the value which the output signal will not go

above.

Address 15 Channel 0 Configuration Word 0

O:e.8 0000 001101000011

Address 15 Channel 0 Configuration Word 0

O:e.8 0000 0000 0100 0011

100 9999

20.5 mA

3.5 mA

Data Value

Output Signal

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 73 74

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Rockwell-automation 1746-NO8V SLC 500 8-Point Analog Output Module/ Us Uživatelský manuál Strana 37