Fuji Electric MICREX-SX series - Page 66

4-34
Section 4 Software Interface
4-3 Analog Input/Output Module
Note 1: Scaling is enabled only when the operation setting switch on the module rear panel is set to “Soft Set Range Operation
mode”. In fixed range operation mode, scaling is disabled.
Note 2: Over range is fixed to “(Gain value - Offset value) x 0.025 + Gain value”.
(“(Gain value - Offset value) x 0.0125 + Gain value” for the range of -10 to +10 V)
On the other hand, under range is fixed to “Offset value - (Gain value - Offset value) x 0.025”.
(“Offset value - (Gain value - Offset value) x 0.0125” for the range of -10 to +10 V)
Note 3: If scaling results in “resolution < maximum resolution”, digital output value does not change in steps of one.
Note 4: Once scaling values are set, they won't change even when range is changed.
<Example 1 of scaling>
Digital input
value
(INT type)
Analog output voltage (V)
10.25
10
-10
-10.25
0
8000 8200
-8200 -8000
Gain value
Offset value
Digital input
value
(INT type)
Analog output voltage (V)
10.25
10
-10
-10.25
4000 4200
-4200 -4000
Gain value
Offset value
Gain: 4000
Offset: -4000
Set values
0
<Example 2 of scaling>
Digital input
value
(INT type)
Analog output current (mA)
20.4
20
4
-3.6
-400
16000 16400
Gain value
Offset value
Gain: 4000
Offset: 1000
Set values
0
0
Digital input
value
(INT type)
Analog output current (mA)
20.4
20
4
1000
4000 4075
Gain value
Offset value
-3.6
<Procedure for scaling>
1) Input “30000” to the parameter setting request register (offset address +4) to activate parameter mode. (Make sure that
the status register is “30001”.)
2) Input gain and offset values to the parameter setting data register, and set ON bit 5 and bit 12 (in the case of channel 5) of
the parameter type setting register.
(In the above example 1 of scaling, set as follows.)
3) Make sure that bit 5 (scaling parameter write mode) and bit 12 (channel 5) of the parameter type setting register are set ON.
4) Set OFF all the bits of the parameter setting data register, and clear al the bits of the parameter setting data register to zero.
This completes the operation for scaling.
15(F) 0
+7
+6
-4000
4000