Rockwell Automation 61C542 Voltage Input module - Manual (Page 28)

4Ć10
4.1.15 LowAlarm Register (Register 29)
Register 29 defines the Low alarm limit. If a channel's input value is
less than this limit, the channel's corresponding bit in register 18 is
set to one. The value in register 29 is a 15Ćbit plus a signĆbit integer.
This value must be in engineering units if scaling is used. If scaling is
used, this value must be smaller than the Maximum Scaling Value
(register 24) andequal to or larger than the Minimum Scaling Value
(register 25). Unscaleddata can range from -4095 to +4095. Note
that if the channel is to be configuredfor unipolar operation (0V to
10V range), the value in register 29 may have to be changedto
reflect input data in the unscaled range of 0 to +4095.
If register 29 does not contain an alarm value less than the High
alarm value, a configuration error will result in register 22. At
powerĆup, the register is set to a default value of -4085.
4.1.16 LowLowAlarm Register (Register 30)
Register 30 defines the Low Low alarm limit. If a channel's input value
is less than this limit, the channel's corresponding bit in register 19 is
set to one. The value in register 30 is a 15Ćbit plus a signĆbit integer.
This value must be in engineering units if scaling is used. If scaling is
used, this value must be smaller than the Maximum Scaling Value
(register 24) andequal to or larger than the Minimum Scaling Value
(register 25). Unscaleddata can range from -4095 to +4095. Note
that if the channel is to be configuredfor unipolar operation (0V to
10V range), the value in register 30 may have to be changedto
reflect input data in the unscaled range of 0 to +4095.
If register 30 does not contain an alarm value lower than or equal to
the Low alarm value, a configuration error will result in register 22. At
powerĆup, the register is set to a default value of -4094.
4.1.17 Configuration Command Register (Register 31)
Register 31 defines line frequency averaging, the average AĆC line
frequency, square root extraction, unipolar inputs, differential inputs,
andwhat action shouldbe taken if an input value is out of range. The
register also contains the Configuration CommandCode. See
figure 4.10.