Rockwell Automation 61C542 Voltage Input module - Manual (Page 22)

4Ć4
4.1.1 A/D Data Registers (Registers 0 to 15)
Registers 0 to 15 hold the latest numeric data from configured analog
voltage input channels 0 to 15. This data has been filtered (50 or 60
Hz filters) and, if the cycle averaging option has been enabled,
averaged together. See figure 4.1. The data is in a 15Ćbit plus a
signĆbit integer format. The data is displayed in engineering units
specified by the Maximum Scaling Value (register 24) and Minimum
Scaling Value (register 25). Unscaled values will range from -4095 to
+4095. If a channel is not configured, its data is held at zero. Note
that if a channel is the second channel (oddĆnumber) of a differential
pair, its data is held at zero.
Register 0 = A/D Data from Channel 0
Register 1 = A/D Data from Channel 1
Register 2 = A/D Data from Channel 2
.
.
.
Register 14 = A/D Data from Channel 14
Register 15 = A/D Data from Channel 15
Figure 4.1 Ć A/D Data Register Assignments
4.1.2 High High Alarm Status Register (Register 16)
Register 16 indicates the current status of each configured channel's
High High alarm. See figure 4.2. A bit is set in this register whenever
a channel's input value exceeds the configured High 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 16
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 4.2 Ć High High Alarm Status Register