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3-2
Chapter 3: Configuring the 1746sc-INO4I
Section 3.3
Configuration
1
When the module must enable a disabled channel, add 1.2 ms to the time shown.
User's Manual Pub. 0300128-04 Rev. A
Channel Update Time
For an output module, channel update time is the time required for the module to
convert the channel data received from the processor to an analog output signal at
the terminals.
In general, you can reduce the channel update time by disabling unused channels,
as shown in the following table:
Table 3-1. Channel update time (channels already enabled)
Current output
Voltage output
(-INO4vi only)
For the fastest possible channel update time, enable only one channel.
Temperature Calibration Time
About once a minute, if no update is occurring, your module performs a
temperature calibration. During this time, your module cannot convert the
channel data received from the processor to an analog output signal at the
terminals. The temperature calibration takes about 56.2 ms
Output Mode Change Time (-INO4vi only)
Whenever the output mode is changed (usually on module start-up), the power
supplied to the isolated channels has to go through a power cycle, affecting all 4
channels. During this time, your module cannot convert channel data from the
processor to analog output signals at the terminals. The power cycle takes about
5.2 seconds.
Your Module's Response to Slot Disabling
By writing to the status file in the modular SLC processor, you can disable any
chassis slot. Refer to your SLC programming manual for the slot disable/enable
procedure.
# of channels enabled
1
2
3
4
1
2
3
4
1
Time
24.3 ms (typical)
27.3
30.7
33.7
24.3
26.9
30.1
32.7
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