Channel status (bit 0), Input type status (bits 1 through 4) – Rockwell Automation 1746-NT8 SLC 500 Thermocouple/mV Analog Input Module User Manual User Manual
Page 53
Publication 1746-UM022B-EN-P - January 2005
Channel Configuration, Data, and Status 4-13
Explanations of the status conditions follow.
Channel Status (Bit 0)
The channel status bit indicates operational state of the channel.
When the channel enable bit is set in the configuration word, the
thermocouple module configures the selected channel and takes a
data sample for the channel data word before setting this bit in the
status word.
Input Type Status (Bits 1 through 4)
The input type bit field indicates what type of input signal you have
configured for the channel. This field reflects the input type defined in
the channel configuration word.
Channel filter
frequency
10 Hz input filter
0
0
50 Hz input filter
0
1
60 HZ input filter
1
0
250 Hz input filter
1
1
Open-circuit
error
No error
0
Open circuit detected
1
Under-range
error
No error
0
Under range condition
1
Over-range
error
No error
0
Over range condition
1
Channel error No error
0
Channel error
1
Channel 0 to 7 Status Word (I:e.0 through I:e.7) - Bit Definitions
To Select
Make these bit settings
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
TIP
It takes one timing cycle to complete an update.
(Refer to Chapter 3 for module update times.)
IMPORTANT
If the channel for which you are seeking status is
disabled, all bit fields are cleared. The status word
for any disabled channel is always 0000 0000 0000
0000 regardless of any previous setting that may
have been made to the configuration word.