Spectrum Controls 1794sc-IRT8I User Manual
Page 41
Chapter 3: Configuring the 1794sc-IRT8I for ControlLogix/CompactLogix
3-15
User's Manual Pub. 0300242‐01 Rev. A
The table below describes the input and status mapping.
Table 3-10 (Input & Status)
Usage (16 bit words):
I:0 Channel 0 input Data.
I:1 Channel 1 input Data.
I:2 Channel 2 input Data.
I:3 Channel 3 input Data.
I:4 Channel 4 input Data.
I:5 Channel 5 input Data.
I:6 Channel 6 input Data.
I:7 Channel 7 input Data.
15
14
13
12
11
10
9 8 7 6 5 4 3 2 1 0
S:0 OverRange (CH0/Bit 8, CH1/Bit 9, …)
4
UnderRange (CH0/Bit 0, CH1/Bit 1, …)
S:1
5
User HI Alarms (CH0/Bit8, CH1/Bit9, …)
5
User LO Alarms(CH0/Bit0, CH1/Bit1, …)
S:2 Reserved
CJC
Alarm
6,4
Open Circuit Alarms (CH0/Bit0,
CH1/Bit1, …)
S:3 Reserved
Diagnostic Code (See )
3.5.1 Input Data [Words 0 to 7]
Words 0 through 7 display the digital value for channel inputs 0 through 7, respectively.
Scaling/range is determined by the data format selected. See 3.4.4 for more details.
3.5.2 UnderRange Alarms [Word 8 (Bits 0 to 7)]
The under range flag is set for the associated channel when the channel data value is
below the minimum scale for the selected range.
3.5.3 OverRange Alarm [Word 8 (Bits 8 to 15)]
The over range flag is set for the associated channel when the channel data value is above
the maximum scale for the selected range.
3.5.4 User Low Alarm [Word 9 (Bits 0 to 7)]
The user low alarm flag is set for the associated channel when the channel data value is
below the user low alarm threshold.
3.5.5 User High Alarm [Word 9 (Bits 8 to 15)]
The user high alarm flag is set for the associated channel when the channel data value is
above the user high alarm threshold.
3.5.6 Open Circuit Alarm [Word 10 (Bits 0 to 7)]
If set, the associated channel has detected a shorted or open circuit condition.
4
For the 0 to 20 mA range, a zero reading is valid. Therefore, under range will not trigger at the low
terminus of zero, but will instead trigger when the signal goes negative at or below %2.5 of full scale. 20 –
0 = 20. -0.025 X 20 = -0.5mA.
5
Channel specific range alarms will apply to CJC values if a CJC format is selected for that channel.
6
Channel specific open circuit alarm will not be set if a CJC format is selected for that channel.