1.2 Main Module Functions
The main module is the heart of the MX100 Data Acquisition Unit.
Ethernet port
Power switch
CF card
slot
Power connector
7-segment LED
Dipswitch*
DATA
ACQUISITION
UNIT
ETHERNET
POWER
10BASE - T
100BASE - TX
100 - 240V AC
Do not operate without reading safety precaution in users manual.
70VA MAX
50/60Hz
SW
ON
1 2 3 4 5 6 7 8
Functional ground terminal
* Normally all switches are ON.
Used when initializing settings
(see page 2-21) and for other
purposes.
ON
1
2
3
4
5
6
7
8
Communications
The main module is equipped with one auto-negotiating 10BASE-T/100BASE-
TX Ethernet port. The LEDs at the upper-left and lower-left of the port indicate the
communication status of the Ethernet interface.
Measurement
The main module acquires measurement data sampled at specified intervals on each
input module. Then, it performs correcting computation and physical conversion on the
measured data and transmits the data to a PC via the Ethernet interface at 100-ms
intervals minimum. Even if the input modules are sampling at intervals less than 100 s
(10 ms or 50 ms), the data is transmitted collectively at 100-ms intervals. In addition, the
main module receives output commands sent from the PC as necessary and generates
signal output instructions to the output modules.
100 ms
100 ms
100 ms
Creation of output data
Output by an output request from the PC
Data sampling when the
measurement interval is 10 ms
Timing when the creation of the
output data starts
Synchronization of Measurements
• Synchronization between modules
If set to the same measurement interval, measurements made by input modules in the
same acquisition unit are synchronized.
• Synchronization between channels
On the 4-CH, High-Speed Universal Input modules and 10-CH high speed digital input
modules (-D05 and -D24), measurements between channels are synchronized.
On the 10-CH, Medium-Speed Universal Input modules, Six-Channel Medium-Speed
Four-Wire RTD Resistance Input modules, and 4-CH Medium-Speed Strain Input
modules (-B12, -B35, and -NDI), measurements are made sequentially one channel
at a time. Therefore, measurements are not synchronized between channels (we can
consider them synchronized within the measurement interval).
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