Rockwell Automation 61C542 Voltage Input module - Manual (Page 23)

4Ć5
4.1.3 High Alarm Status Register (Register 17)
Register 17 indicates the current status of each configured channel's
High alarm. See figure 4.3. A bit is set in this register whenever a
channel's input value exceeds the configured High alarm limit. The
bit is reset when the input value returns to a level below the
configured limit.
When two channels are configured as a differential pair, only the bit
representing the first channel (evenĆnumber) will be updated. The
second channel's status bit will remain at zero.
Register 17
Bits 0Ć15
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit 5 = Channel 5
Bit 6 = Channel 6
Bit 7 = Channel 7
Bit 8 = Channel 8
Bit 9 = Channel 9
Bit 10 = Channel 10
Bit 11 = Channel 11
Bit 12 = Channel 12
Bit 13 = Channel 13
Bit 14 = Channel 14
Bit 15 = Channel 15
Bit 0 = Channel 0
Bit 1 = Channel 1
Bit 2 = Channel 2
Bit 3 = Channel 3
Bit 4 = Channel 4
R R R R R R R R R R R R R R R R
Figure 4.3 Ć High Alarm Status Register
4.1.4 Low Alarm Status Register (Register 18)
Register 18 indicates the current status of each configured channel's
Low alarm. See figure 4.4. A bit is set in this register whenever a
channel's input value is less than the configured Low alarm limit. The
bit is reset when the input value returns to a level above the
configured limit.
When two channels are configured as a differential pair, only the bit
representing the first channel (evenĆnumber) will be updated. The
second channel's status bit will remain at zero.
Register 18
Bits 0Ć15
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit 5 = Channel 5
Bit 6 = Channel 6
Bit 7 = Channel 7
Bit 8 = Channel 8
Bit 9 = Channel 9
Bit 10 = Channel 10
Bit 11 = Channel 11
Bit 12 = Channel 12
Bit 13 = Channel 13
Bit 14 = Channel 14
Bit 15 = Channel 15
Bit 0 = Channel 0
Bit 1 = Channel 1
Bit 2 = Channel 2
Bit 3 = Channel 3
Bit 4 = Channel 4
R R R R R R R R R R R R R R R R
Figure 4.4 Ć Low Alarm Status Register