Rockwell Automation 1746-NR4 SLC RTD/Resistance Input Module User Manual - Manual (Page 61)

Publication 1746-UM008B-EN-P - December 2006
Preliminary Operating Considerations 61
Channel Turn-on, Turn-off,
and Reconfiguration Time The table below gives you the turn-on, turn-off, and reconfiguration
times for enabling or disabling a channel.
Response to Slot Disabling By writing to the status file in your modular SLC processor you can
disable any chassis slot. Refer to your SLC programming manual for
the slot disable/enable procedure.
Function Description Duration
Turn-on Time The time it takes to make converted data available in the data word and to
set the status bit (transition from 0 to 1) in the status word, after setting the
enable bit in the configuration word. Requires up to one module update
time plus one of the following:
• 250 Hz Filter = 388 ms
• 60 Hz Filter = 1300 ms
• 50 Hz Filter = 1540 ms
• 10 Hz Filter = 7300 ms
Turn-off Time The time it takes to reset the status bit (transition from 1 to 0) in the status
word and to zero the data word, after resetting the enable bit in the
configuration word. Requires up to one module update
time.
Reconfiguration
Time The time it takes to change a channel configuration if the device type, filter
frequency, or excitation current is different from the current setting. The
enable bit remains in a steady state of 1. (Changing temperature/resistance
units or data format does not require reconfiguration time.) Requires up to one module update
time plus one of the following:
• 250 Hz Filter = 124 ms
• 60 Hz Filter = 504 ms
• 50 Hz Filter = 604 ms
• 10 Hz Filter = 3,004 ms
ATTENTION
Always understand the implications of disabling a RTD module
in your application before using the slot disable feature.