Rockwell Automation 1746-NO8V SLC 500 8-Point Analog Output Module/ User Manual - Manual (Page 40)

Publication 1746-UM026A-EN-P - September 2003
4-16 Configuring the Module
Suppose, also, that you would like to provide an alarm if the output
data word was commanded to less than 100 counts and greater than
30,000 counts. You would enter the following for Channel 6 data
parameters 1 and 2.
O:e.22 Value = 100 decimal
O:e.30 Value = 30000 decimal
Now set the bits in the Channel 6 configuration word.
Monitor bit 2 of Channel 6 Input Status Word 2 (I:e.14). When the
bit is a 1 (Limit Alarms Valves Set), then set the Channel 6
configuration back to it’s original value.
Set Ramping / Rate Limiting Values
This feature allows the output to change at a user configured rate. It
limits the rate at which the output will change. This can be set on a
channel-by-channel basis. The Ramping/ Rate Limiting value for a
channel is configured by placing the desired value into the Output
Data Parameter Word 1 for the desired channel, and then setting the
Output Configuration Word for the channel to Set the Ramping/Rate
Limiting Value
The ramping/rate limiting value that is placed in Output Data
Parameter 1 can be calculated by using the following equation:
•
1746-NO8V Value
= (Change in Voltage / no. of seconds for the change) X 10
•
1746-NO8I Value
= (Change in Current / no. of seconds for the change) X 10
The Ramping/Rate Limiting value is defined as 100 mV/second for the
1746-NO8V and 0.1 mA/second for the 1746-NO8I for all data formats
and data ranges. For example, a value of 40 equates to 4 Volts/second.
This means if the channel was commanded to go from 2 to 8 Volts, it
would take (8-2 Volts)/4 seconds = 1.5 seconds to get there.
Address 15 Channel 6 Configuration Word 0
O:e.14 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1
Address 15 Channel 6 Configuration Word 0
O:e.14 0 0 0 0 0 1 1 1 0 0 0 0 0 1 0 1
Address 15 Channel 6 Configuration Word 0
O:e.14 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1