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 bein g 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.