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FX2N-5A Special function block Buffer Memory (BFM) 7
7-21
7.2.12 BFM 21 Writes I/O characteristics (offset/gain Scaling function setting) (READ/WRITE)
The b0 to b4 bits of BFM 21 are assigned to each channel of the FX
2N
-5A. (Bit 4 is assingned
to the analog output channel, bit 3 is assigned to input channel 4, bit 0 is assigned to input
channel 1.)
When a bit is set to ON, the offset data (BFM 41 to BFM 45) and the gain data (BFM 51 to BFM
55) or the Scaling function data (BFM 200 to BFM 249) of the assigned channel are written to
the built-in memory (EEPROM).
It is possible to adjust the settings for two or more channels at the same time (writing "H1F",
will set the new offset/gain data for all channels). After writing is completed, BFM 21 returns
automatically to K0.
On fault input, the module will ignore other bits than b0 to b4 and perform nothing except
keeping K0 as content of BFM21.
Scale over status (BFM 28) data existing before a change of the I/O characteristics will not be
automatically cleared by performing a change of the I/O characteristics.
Writing to BFM 21 triggers data to be written to the internal EEPROM. To protect the internal
EEPROM from being destroyed by permanently writing the same value to BFM 21, there is a
safety function which will memorize the value of BFM 21 to protect the internal EEPROM from
being destroyed by accidentally writing the same value continuously to BFM
21.
BFM21
b15, b14, b13, b12, b11, b10, b9, b8, b7, b6, b5, b4
, b3, b2, b1, b0
Invalid
1) Analog input CH1
2) Analog input CH2
3) Analog input CH3
4) Analog input CH4
5) Analog output channel
1)
2)
3)
4)
5)