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The OM-WEB-TC provides 8 thermocouple channels and 8 digital I/O channels. The included external power supply (ac adaptor) is used to provide power. On-board LEDs display the status of communications and external power. All hardware configurable options are selectable with the web browser or the included Instacal utility software. Network configurable options are settable using Instacal. When using Instacal, if the login settings have been changed from the default, a login name and password are required to change the configuration settings. The OM-WEB-TC provides 8 differential thermocouple input channels. A 24-bit analog-to-digital (A/D) converter is provided for each pair of analog inputs. Thermocouple types J, K, T, E, N, R, S, B are supported. The thermocouple type is software programmable for each channel. Four cold junction compensation (CJC) sensors are provided for thermocouple measurements. Each CJC sensor is dedicated to two thermocouple input channels. An open thermocouple detection feature lets you detect a broken thermocouple. An on-board microprocessor automatically linearizes the measurement data.
The OM-WEB-TC features 8 independent temperature alarms, Each alarm controls an associated digital I/O channel as an alarm output. The input to each alarm is one of the temperature input channels, the output of each alarm is software configurable as an active high or low. The user configurable threshold conditions activate each alarm. When an alarm is activated, the associated DIO channel is driven to the active output state selected. Eight digital I/O channels are provided to communicate with external devices and to generate alarms. The digital bits are software programmable for input or output. The digital output voltage is switchselectable for 3.3V or 5V logic. A screw terminal is provided for pull-up or pull-down configuration.
The OM-WEB-TC web interface displays current data read from the device and does not log or store historical data. Use the included TracerDAQ software to log or graphically trend your data. The OM-WEB-TC module ships with an impressive array of software, including TracerDAQ®, a full-featured, out-of-the-box data logging, viewing, and analysis application. Driver support and detailed example programs are included for Universal Library programming libraries for Microsoft® Visual Studio® programming languages, and other languages, including DASYLab®, and ULx for NI LabVIEW® (comprehensive library of VIs and example programs compatible with 32-bit and 64-bit LabVIEW 2010 or later) and InstaCalTM installation, calibration and test utility-powerful solutions for programmers and nonprogrammers alike. These modules operate under Microsoft Windows® VISTA/7/8/10 (32-bit and 64-bit) operating systems.
A/D Converter: 4 dual 24-bit sigma delta A/D converters
Input Isolation: 500 Vdc min between field wiring and USB interface
Number of Channels: 8 differential temperature inputs
Differential Input Voltage Range: ±0.080V
Absolute Maximum Input Voltage: ±25V (power on), ±40V (power off)
Throughput Rate: 2 samples/sec max for all active channels
Input Impedance: 5 G? min
Input Leakage Current: 105 nA max (with open thermocouple detection enabled)
Normal Mode Rejection Ratio: 90 dB min
Common Mode Rejection Ratio: 100 dB min
Warm-Up Time: 30 minutes max
Open Thermocouple Detection: 3 sec open detection time (max)
CJC Sensor Accuracy: -0.75 to 0.5°C max (15 to 35°C);
-1.5 to 1.25°C max (0 to 55°C)
Number of Digital I/O Channels: 8
Configuration: Each DIO bit can be independently configured for input or output.
Switch selectable output voltages of 5V or 3.3V.
Power on reset is input mode unless bit is configured for alarm
Pull-Up/Pull-Down Configuration: All pins are connected to 47 ? resistors
(user configurable for pull-up mode to 5V or pulldown mode).
Digital I/O Transfer Rate (Software Paced):
Digital Input: 50 port reads or single bit reads per second (typical)
Digital Output: 100 port writes or single bit writes per second (typical)
Input High Voltage: 4.0V min, 5.5V absolute max (5V mode);
2.64V min, 5.5V absolute max (3.3V mode)
Input Low Voltage: 1.0V max, -0.3V absolute min (5V mode);
0.66V max, -0.3V absolute min (3.3V mode)
Output High Voltage: 4.3V min (5V mode),
2.7V min (3.3V mode); IOH = -2.5 mA
Output Low Voltage: 0.6V max (IOL = 2.5 mA)
Temperature Alarms: 8 (one per digital I/O line)
Device Type: IEEE 802.3 Ethernet 10Base-T
Device Compatibility: IEEE 802.3-2003 10 Mpbs Media Access Control
Ethernet Type: 10Base-T
Connector: RJ-45, 8 position
Cable: CAT-5 shielded, unshielded twisted pair
Length: 100 m (328') max
MAC Address: 00:12:71:Cx:xx:xx where xxxxx is the device's serial number
Network Factory Default Settings
IP Address: 192.168.0.101
Subnet Mask: 255.255.255.0
DHCP Setting: Enabled
User Name: "webtc"
Web Server: Enabled
Protocols Implemented: IP, ARP, ICMP, DHCP, UDP, TCP, NBNS, HTTP
UDP Messaging Protocol: UDP port 54211
TCP Downloading Protocol: TCP port 54267
HTTP 1.0 Alternate Port: TCP port 49152-65535 (not including 54267)
Network Name: "webtc_xxxxx", where xxxxx is the device's serial number
Max Number of Simultaneous HTTP Connections: 3
Max Number of Non-HTTP TCP Sockets: 5
Security Implementation: IP address based session manager with username/password
login for configuration and control transactions (data is not secured)
Session Timeout: 5 min with no activity
Username/Password Encryption: Base64 (the default web page does not support
Vulnerabilities: Denial of service attacks, username/password spoofing,
script probing and simple decryption
Memory: EEPROM (512 bytes for sensor configuration);
FLASH (2 MB for device configuration and website storage)
Microcontroller: One high-performance 8-bit RISC microcontroller and one high-performance 16-bit RISC microcontroller
Power Supply Voltage (Supplied by Included External Power Supply): 5 Vdc ±5%
Power Supply Current (Supplied by Included External Power Supply): 440 mA max
User Output Voltage (5V): 4.65V min to 5.25V max
Dimensions: 127 L x 89 W x 36 mm D (5.0 x 3.5 x 1.4")
Input Connections: Screw terminal blocks (accept 16 to 30 AWG wire)
Operating Temperature: 0 to 55°C (32 to 131°F), 0 to 90% RH non-condensing
Storage Temperature: -40 to 85°C (-40 to 185°F)