Module alarms, Overrange alarm, Underrange alarm – Rockwell Automation 1732E-IR4IM12R ArmorBlock Dual-Port EtherNet/IP 4-Point Thermocouple and RTD User Manual
Page 13: Overrange alarm underrange alarm
Rockwell Automation Publication 1732E-UM004A-EN-E - July 2012
5
Overview of the 1732E ArmorBlock Thermocouple and RTD Input Modules Chapter 1
It supports 3-wire and 2-wire RTDs using a jumper in the wiring at the input
connector of the module. The following RTD input types are supported.
The module uses a third sensor wire to measure and correct for the cable lead
resistance for each RTD type. The compensation circuit depends on an outside
module jumper to connect the third wire if the compensating lead wire is not
available (that is, if a 2-wire RTD is connected to the I/O connector).
If the lead resistance is not directly measured with the third lead wire, the user can
specify a lead wire resistance offset to be applied to the data for direct
compensation via RSLogix 5000.
Module Alarms
The ArmorBlock Thermocouple and RTD modules are capable of generating the
following alarms.
• Overrange
• Underrange
• Level (low, low-low, high, high-high)
• Open-wire detection
Overrange Alarm
The channel overrange alarm is set if the input is greater than the maximum
temperature (thermocouple or RTD range dependent), millivolt (+78 mV) or
resistance (600
Ω
) range value, or above the maximum range of the thermocouple
or RTD.
Underrange Alarm
The channel underrange alarm is set if the input is less than the minimum
temperature (thermocouple or RTD range dependent), millivolt (-78 mV) or
Supported RTD Types
RTD type
Temperature Range °C (°F)
Voltage Range
100
Ω
Pt 385
0…390.48
Ω
-200…850 °C (-328…1562 °F)
0…150 mV
200
Ω
Pt 385
0…781
Ω
-200…650 °C (-328…1202 °F)
0…300 mV
100
Ω
Pt 3916
0…337.03
Ω
-200…630 °C (-328…1166 °F)
0…156.25 mV
200
Ω
Pt 3916
0…674.06
Ω
-200…630 °C (-328…1166 °F)
0…312.5 mV
10
Ω
Cu 427
0…19.116
Ω
-320…500 °C (-544…932 °F)
0…19.47 mV
120
Ω
Ni 672
0…445.10
Ω
-70…445 °C (-94…833 °F)
0…156.25 mV
100
Ω
Ni 618
0…198.88
Ω
-60…180 °C (-76…356 °F)
0…75 mV
120
Ω
Ni 618
0…238.65
Ω
-90…140 °C (-130…284 °F)
0…75 mV