Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 10)

<3. Functions>
3-1
IM 11B06F01-01E
3. Functions
ASIU has the following functions.
1. Access the I/O cards (DI read, DO write and read back, AI read)
2. Creating the alarm information
3. Interface to DCS through Modbus RTU Slave or Modbus TCP Server
3.1 I/O card
ASIU accesses the I/O card such as DI, DO and AI attached on the FCN to read and write the
data periodically.
Scan interval: 100 msec.
The slots which is not assign the I/O on the resource configurator are not made a read and write,
even IOP check.
l DI card
Max. 16 points of the digital inputs are read periodically.
l DO card
Max. 16 points of the digital output are written and read back the output status periodically.
l AI card
Max. 16 points of the analog data is read periodically.
Data type: Real number
Range:
0.0 to 1.0
Accuracy: It follows the specification of each module used. Refer to the GS of the relevant ana-
log card.
Input signal AI IOP
106.3 % or more 1.0 1
100 to 106.3 % 1.0 0
0 to 100 % 0.0 to 1.0 0
-6.3 to 0 % 0.0 0
-6.3 % or less 0.0 1
The value of the analog data which is not assigned on the resource configurator is always 0, and
the IOP is also 0.
4th Edition : Nov. 22, 2011-00