FX2N-5A Special function block Buffer Memory (BFM) 7
7-23
b8 to b11: switch off range over/range under alarm for corresponding input channel
The value of BFM 22 is stored non-volatile in the internal EEPROM. There is a safety function
to protect the internal EEPROM from being destroyed by accidentally writing the same value
continuously to BFM 22.
7.2.14 BFM 23 Set parameter for direct control between the input channel and output channel
(READ/WRITE)
In BFM 23, the user can specify direct control feedback between all 4 analog input channels
and the analog output channel.
The format of BFM 23 is a 4 digit hex value and each digit is represents the operation of one
input channel.
The values of the Hex digits are as follows:
H0:The corresponding analog input channel has no influence on the analog output value.
H1:The average input value (BFM 6 to BFM 9) of the corresponding analog input channel is
added to the analog output value in BFM 14.
H2:The immediate input value (BFM 10 to BFM 13) of the corresponding analog input channel
is added to the analog output value in BFM 14.
H3:The average input value (BFM 6 to BFM 9) of the corresponding analog input channel is
subtracted from the analog output value in BFM 14.
H4:The immediate input value (BFM 10 to BFM 13) of the corresponding analog input channel
is subtracted from the analog output value in BFM 14.
H5 to HF: The corresponding analog input channel has no influence on the analog output
value, however, the direct output control error bit (bit 15) in BFM 29 will be switched
on.
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