8-channel NTC input
The module provides NTC1 through NTC8 and connects 2-wire NTC thermistor sensors with R25 = 10 kΩ and B25/85 = 3976 K.
BL335
N Series Distributed I/O
Sense. Isolate.
Measure.
N3087 provides 8 NTC thermistor input channels, NTC1 through NTC8. It connects 2-wire NTC thermistor sensors (R25 = 10 kΩ, B25/85 = 3976 K) for on-site temperature acquisition.
Each channel input is electrically isolated and converted into a digital signal transmitted at 16-bit resolution, with a 300 ms conversion rate and a measurement range of 184.8 Ω to 667,828 Ω.
8NTC input channels
16 BitSignal resolution
±2%Accuracy with 100 kΩ / 20 m AWG16
300 msConversion rate
8 NTC channelsNTC1 through NTC8.
2-wire NTC 10 kΩR25 = 10 kΩ, B25/85 = 3976 K.
DIN-35 mountFor distributed fieldbus I/O systems.
Technical specifications
N3087 technical specifications.
Input type, measurement range, resolution, accuracy, conversion rate, wiring requirements, environmental ratings, dimensions, terminal definitions, and distributed I/O system requirements.
8NTC input channels
16 BitSignal resolution
±2%Accuracy with 100 kΩ / 20 m AWG16
DIN-35Industrial rail installation
N3087 measurement views
N3087 reads a 2-wire NTC thermistor input (R25 = 10 kΩ, B25/85 = 3976 K) and reports it as a temperature or as a resistance value on the same 8-channel, electrically isolated, 16-bit input platform.
| Selection point | Temperature view | Resistance view |
|---|---|---|
| Model | N3087 | N3087 |
| Measured quantity | Temperature (°C) | Resistance (Ω) |
| Range | -50°C to 150°C (see R-T table) | 184.8 Ω to 667,828 Ω |
| Channels | 8 channels | 8 channels |
| Resolution | 16 Bit | 16 Bit |
| Conversion rate | 300 ms | 300 ms |
Electrical specifications
NTC input, conversion, power, and indication data for the N3087 module.
01
ModelN3087
Input channels8 channels, NTC1 to NTC8
Input type2-wire NTC thermistor, R25 = 10 kΩ, B25/85 = 3976 K (reference value)
Measurement range184.8~667,828 Ω
Channel isolationEach channel input is electrically isolated and converted into a digital signal
Resolution16 Bit
Accuracy±2% with a 100 kΩ resistor, within a 20 m AWG16 shielded cable
Conversion rate300 ms
Internal bus power5 VDC, 31 mA at 5 VDC
Power indicationLeft P: 24 V power indicator; right P: 3.3 V power indicator; red LED on means power normal, off means power abnormal
Channel indicationPanel positions 1 to 16 are reserved
Panel markingI/O module signal type and I/O module model are printed on the panel
Wiring and installation
Connection and mounting data for the N3087 module.
02
Terminal designCage spring connections; one conductor per cage spring
Supported conductor typesSolid, stranded, and fine-stranded conductors
Multiple-conductor ruleJoin multiple conductors into a single point before connection
Conductor diameter0.3 to 2.5 mm² / AWG 22 to 14
Strip length8 to 9 mm / 0.33 in
Cable recommendationShielded cables are recommended
NTC terminalsA1 NTC1+; A2 NTC2+; A3 NTC3+; A4 NTC4+; A5 NTC5+; A6 NTC6+; A7 NTC7+; A8 NTC8+
NTC negative terminalsB1 NTC1-; B2 NTC2-; B3 NTC3-; B4 NTC4-; B5 NTC5-; B6 NTC6-; B7 NTC7-; B8 NTC8-
PE terminalsA9 and B9 are PE (shield ground)
InstallationIEC 60715 DIN-35 rail mounting
Environmental performance
Operating limits and protection information stated in the manual.
03
Operating temperature-20°C to 55°C
Storage temperature-40°C to 70°C
Relative humidity5%RH to 95%RH, non-condensing
Operating altitude0 to 2,000 m
Protection typeIP20
EMCIEC 61000-4-2 (ESD) Level 3 and IEC 61000-4-5 (Surge) Level 3
Mechanical and system data
Physical dimensions and distributed I/O system requirements.
04
Dimensions15.4 × 104.6 × 74.9 mm
Weight71.2 g
Internal bus8 data contacts; gold-plated contacts are self-cleaning before connection
Required couplerA suitable fieldbus coupler, such as a BL210 Series coupler
Station arrangementI/O modules may be arranged in any combination without grouping by module type
Installation sequenceStarting from the fieldbus coupler, assemble I/O modules from left to right; insert from the right and top along the module guide rails; install an end cap on the last module
RemovalUse a flat-head screwdriver or similar tool to pry the rail clip upward, then pull the module away from the DIN rail
Electrically isolated inputs
Each channel input is electrically isolated and converted into a digital signal transmitted at 16-bit resolution.
Distributed I/O module
N3087 is an optional N-Series I/O module and must be combined with a suitable coupler, such as a BL210 Series coupler.
N3087 NTC input characteristics
8 NTC inputs. 16-bit. 300 ms.
N3087 combines eight electrically isolated NTC thermistor input channels, 2-wire NTC 10 kΩ sensor support, 16-bit resolution, ±2% accuracy, a 300 ms conversion rate, cage spring wiring, and stated EMC protection.
8-channel input
Read NTC1 through NTC8 in one 15.4 mm-wide module.
Two-wire NTC 10 kΩ
Connect 2-wire NTC thermistor sensors with R25 = 10 kΩ and B25/85 = 3976 K.
16-bit input
Input signals are converted into digital values with 16-bit resolution and a 300 ms conversion rate.
Specified environment
IP20 protection, IEC 61000-4-2 and IEC 61000-4-5 Level 3 EMC, and -20°C to 55°C operation.
Reference data
NTC temperature–resistance table.
Reference values for the 2-wire NTC thermistor (R25 = 10 kΩ, B25/85 = 3976 K) used with the N3087 module. Resistance values are in ohms.
Temperature ↔ resistance reference
Values taken from the N3087 user manual, V1.0.
| °C | Ω | °C | Ω | °C | Ω | °C | Ω |
|---|---|---|---|---|---|---|---|
| -50 | 667,828 | 8 | 21,921 | 23 | 10,923 | 70 | 1,751 |
| -40 | 335,671 | 9 | 20,885 | 24 | 10,450 | 75 | 1,480 |
| -30 | 176,683 | 10 | 19,904 | 25 | 10,000 | 80 | 1,256 |
| -20 | 96,974 | 11 | 18,974 | 26 | 9,572 | 85 | 1,070 |
| -15 | 72,895 | 12 | 18,092 | 27 | 9,165 | 90 | 916.1 |
| -10 | 55,298 | 13 | 17,257 | 28 | 8,779 | 95 | 787 |
| -5 | 42,314 | 14 | 16,465 | 29 | 8,408 | 100 | 678.6 |
| 0 | 32,650 | 15 | 15,714 | 30 | 8,056 | 105 | 587.3 |
| 1 | 31,030 | 16 | 15,001 | 35 | 6,530 | 110 | 510.1 |
| 2 | 29,500 | 17 | 14,325 | 40 | 5,325 | 115 | 444.5 |
| 3 | 28,054 | 18 | 13,623 | 45 | 4,367 | 120 | 388.6 |
| 4 | 26,688 | 19 | 13,053 | 50 | 3,601 | 125 | 340.8 |
| 5 | 25,396 | 20 | 12,494 | 55 | 2,985 | 130 | 300 |
| 6 | 24,173 | 21 | 11,943 | 60 | 2,487 | 140 | 234.1 |
| 7 | 23,016 | 22 | 11,420 | 65 | 2,082 | 150 | 184.8 |
Connection and installation
Terminal definitions and module installation.
Use the defined NTC and PE terminals, and install the module on a compliant DIN-35 rail as part of the distributed I/O station.
Terminal definitions
NTC1 to NTC4A1/A2/A3/A4 are NTC1+/NTC2+/NTC3+/NTC4+; B1/B2/B3/B4 are NTC1-/NTC2-/NTC3-/NTC4-.
NTC5 to NTC8A5/A6/A7/A8 are NTC5+/NTC6+/NTC7+/NTC8+; B5/B6/B7/B8 are NTC5-/NTC6-/NTC7-/NTC8-.
Input type2-wire NTC thermistor, R25 = 10 kΩ, B25/85 = 3976 K (reference value).
Protective earthA9 and B9 are PE (shield ground).
Installation and internal bus
Rail and sequenceMount on a DIN 35 rail compliant with IEC 60715 and assemble modules from the fieldbus coupler left to right.
Insert the moduleAlign the spring clips with the grooves on the coupler or previous module, keep the rail clip unlocked, press the module into position until it snaps onto the rail, then lock the rail clip.
Data contactsEight gold-plated, self-cleaning data contacts provide communication and system power through the internal bus.
End cap and removalInstall an end cap on the last module. To remove a module, pry the rail clip upward with a flat-head screwdriver or similar tool and pull the module away from the DIN rail.
Use 0.3 to 2.5 mm² / AWG 22 to 14 conductors, strip 8 to 9 mm / 0.33 in, and use shielded cables as recommended.
N-Series module family
More N-Series I/O module options.
The N-Series includes digital input, digital output, analog input, analog output, RTD, NTC, temperature, pulse, and power modules.
I/O modules can be arranged in different combinations within the distributed I/O station without grouping them by module type.
27 modules · 9 categories
6 modules
DI
Digital input options for NPN, PNP, and dry-contact sensing.
-
N116116CH DI Module (Low-Level Trigger / NPN)
-
N116216CH DI Module (High-Level Trigger / PNP)
-
N116316CH DI Module (Dry Contact)
-
N132132CH DI Module (NPN)
-
N132232CH DI Module (PNP)
-
N132332CH DI Module (Dry Contact)
5 modules
DO
Digital and relay output options for discrete control.
-
N20848CH Relay Output Module
-
N216116CH DO Module (PNP)
-
N216216CH DO Module (NPN)
-
N232132CH DO Module (PNP)
-
N232232CH DO Module (NPN)
3 modules
AI
Analog input options for current and voltage acquisition.
-
N30464CH 16-bit AI Module, Differential Input, ±5V / ±10V
-
N30818CH 16-bit AI Module, Single-Ended Input, 0/4-20mA
-
N30838CH 16-bit AI Module, Single-Ended Input, 0-5V / 0-10V
2 modules
AO
Analog output options for current and voltage control.
-
N40818CH 16-bit AO Module, 0/4-20mA Output
-
N40868CH 16-bit AO Module, ±5V / ±10V Output
4 modules
RTD
RTD modules for PT100 and PT1000 temperature sensing.
-
N50414CH RTD Module, three-wire PT100
-
N50424CH RTD Module, three-wire PT1000
-
N50434CH RTD Module, four-wire PT100
-
N50444CH RTD Module, four-wire PT1000
2 modules
NTC
NTC thermistor input options for temperature measurement.
-
N3087Current model8CH NTC Thermistor Input Module, 2-wire NTC 10 kΩ
-
N50858CH NTC Module
1 module
Temperature
Dedicated thermocouple module for TC signals.
-
N50888CH TC Module
3 modules
Pulse
Pulse counting and pulse-output control modules.
-
N90813CH Pulse Counter + 5×DI
-
N90826CH Pulse Output + 2×DO
-
N90832CH Pulse Output (Pulse Count Control) + 4×DI + 2×DO
1 module
Power
Additional power support for larger N-Series stations.
-
N7021Power Module
Important system note
When the number of selected N-Series I/O boards exceeds 20, an additional power module is required. If the number is less than 20, no extra power module is needed.
Installation and wiring
Key operating steps from the N3087 manual.
The manual specifies the installation sequence, module insertion and removal procedure, cable selection rules, and the N3087 wiring example.
Installation sequence
Mount the coupler and I/O modules on a DIN 35 rail compliant with IEC 60715, then assemble modules from the fieldbus coupler left to right.
Inserting a module
Align the spring clips with the grooves of the coupler or previous module, keep the rail clip unlocked, press the module into position until it snaps onto the rail, and lock the rail clip.
Removing a module
Use a flat-head screwdriver or similar tool to pry the rail clip upward, then pull the I/O module away from the DIN rail.
Cable selection
Cage spring connections accept solid, stranded, and fine-stranded conductors. Use one conductor per cage spring, 0.3 to 2.5 mm² / AWG 22 to 14, with an 8 to 9 mm strip length.
