Introduction 
Simple configuration, easy programming and supported by major DA & C packages - these are just a few reasons to use Advantech's ADAM 4000 modules.
The ADAM-4018 is a 16-bit, 8-channel analog input module that provides programmable input ranges on all channels. This module is an extremely cost-effective solution for industrial measurement and monitoring applications. 500VDC optical isolation between the analog input and the module protects the module and peripherals from damage due to high input-line voltages.
You can use any high-level language with ASCII-based string functions (such as C, Pascal or BASIC) to communicate with ADAM modules or process their data. For example, the command and response for an analog input module would be: COMMAND: #5, RESPONSE: > 4.834. This command requests the data stored by the module with address 05 (Hex). The module responds with the value 4.834 V.
ADAM's built in checksum feature ensures data integrity by detecting communication errors. This feature adds two checksum characters to every command or response string that enable you to verify that the message received is exactly the same as the message sent.
Easy-to-use menu-driven utility software make configuration and calibration a snap. Its terminal emulation program lets you easily read from and write to ADAM modules. Writing application programs with this software (ADAMView) is simple, you can learn the basics in just a few minutes.
ADAM-4018 Datasheet
Applications
Specifications
Communication
- RS-485 (2-wire) to host
- Speeds: 1200, 2400, 4800, 9600, 19200 bps
- Max. communication distance: 4000feet (1.2Km)
- Power and communication LED indicator
- ASCII command/response protocol
- Communication error checking with checksum
- Asynchronous data format: 1 start bit, 8 data bits, 1 stop bit, no parity
- Up to 256 multidrop modules per serial port
- On-line module insertion and removal
- Transient suppression on RS-485 communication lines
Power Requirements
- Unregulated 10 30 VDC
- Protected against power reversal
Mechanical
- Case: ABC with captive mounting hardware
- Plug-in screw terminal block:
Accepts 0.5 mm² to 2.5 mm²
1-#12 or 2-#14 to #22 AWG
Environment
- Operating temperature: 14 to 158ºF (-1000 to 70ºC)
- EMI: Meets FCC Class A
- Storage temperature: -13 to 185ºf (-25 to 85ºC)
- Humidity: 5 to 95%, non-condensing
Analog Input
- Channels: Six differential, two single-ended
- Input type: Thermocouple, mV, V or mA
- Input range: ±15 mV, ±50 mV, ±100 mV, ±500 mV, ±1 V, ±2.5 V, ±20 mA
- TC Type: J, K, T, E, R, S, and B
Characteristics
- Isolation voltage: 500 VDC
- Sampling rate: 10 samples/sec. (total)
- Bandwidth: 13.1 Hz
- Accuracy: ±0.1% or better
- Zero drift: ±0.3 µV/°C
- Span drift: ±25 ppm/°C
- CMR @ 50/60 Hz: 92 dB min.
Power
- Power requirements: 10 to 30 V (non-regulated)
- Power consumption: 1.2 W
Ordering Information
- ADAM-4018
8-Channel Thermocouple Input Module
- We are investigating a compatibility problem with the ADAM-4018 and Windows 95. Check back here often for more details. 7/12/96
- The ADAM-4018 is supported by the AdamView software, but not listed in Device setup. Since the data acquisition commands of ADAM-4018 are exactly the same as those of ADAM-4017, the ADAM-4018 can be used in ADAMView software as if it were an ADAM-4017. Simply select the ADAM-4017 setting for ADAM-4018 in hardware setup. 7/11/96
- Since the data acquisition commands of the ADAM-4018 are exactly the same as those of the ADAM-4017, the ADAM-4018 can be used in AdamView and Labtech software as if it were an ADAM-4017. Simply select the 4017 setting for a 4018 instead.
- Q. Why does the 5th Channel of the ADAM-4018 have a data drift?
- A. There was a localized heating problem that was found before and it caused the reading in ch5 to ch7 to drift. After some testing, we found the reading will be 1.5 degree C higher than real temperature. In order to correct the reading, firmware in the ADAM-4018 will subtract the reading by 1.5 degree C, to make the value reported very close to real value. (10/11/96)
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- Q. Why is there a 1 degree difference between ADAM-4018 channels 5, 6, and 7?
- A. The thermocouple measurement needs the CJC (cold junction compensation) circuit. ADAM has only one CJC for all 8 channels. The CJC is located at the upper-left side of the module. The CJC should be as close as possible to the measurement point to get an accurate result. But it's impossible to do this because channels 0 to 4 are on one side and channels 5 to 7 are on the other side. The 1 deg. C temperature error of channels 5 to 7 is actually the temperature difference of the two sides. This is not a problem, but a normal condition on the ADAM-4018. This will continue unless an isotherm block can be built for all 8 channels, but that's very difficult and unrealistic. The readings of channels 5 to 7 are added with an 1 deg. C intentionally in the internal firmware. The reason this compensates the difference between the two sides of the ADAM-4018. In the ADAM-4018 development phase, we found the readings of channels 5 to 7 is always different from those of channels 0 to 4 in long term tests. The error is about 1 deg. C. So we modified firmware to add 1 deg.C for channel 5 to 7. This will give more accurate readings for channels 5 to 7.
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- Q. What is the accuracy for a T type thermocouple for the ADAM-4018 in degrees Celsius?
- A. The typical accuracy for a T type thermocouple is /- 1.0 degree C. The maximum error for T type thermocouple is /- 1.5 degree C.
- Note: The accuracy of the module quoted as /- 0.1 % is meant of voltage at full scale; it is not meant of the thermocouple full scale.
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