Digital Output Values; Write Data Error Code - Mitsubishi Electric MELSEC A Series Manual

3. SPECIFICATIONS
3.7.3

Digital output values

Address 10 to 17
3.7.4

Write data error code

Digital values after A – D conversion are stored to buffer memory addresses 10 to
17 for each channel.
Digital output values are 16-bit, singed binary. The ranges vary depending on the
resolution setting, as indicated below:
b15 b14 b13 b12 b11 b10 b9
1/0
Sign bit
1: Negative
0: Positive
(1) When data is written to the A68ADN from the PC CPU, data range checks and
read/write area access checks are only made once.
outside the designated range, an error code is stored (as a 16-bit binary value)
in buffer memory address 18.
Section 6.1 gives error code details.
(2) If more than one type of error occurs, only the error code of the first error is
stored in the A68ADN.
(3) To reset the error code, use the sequence program to turn Y12 ON (see Section
5.1).
(4) When an error is reset, the data error code is set to 0 and the RUN LED of the
A68ADN stops flashing
b8 b7 b6
Data area
Resolution 1/4000 : 12 bits
Resolution 1/8000 : 13 bits
Resolution 1/12000 : 14 bits
Bits other than data area bits and sign bits are:
1 when 1 (negative) is set at b15
0 when 0 (positive) is set at b15
(A negative digital value is expressed in 2's complement.)
3 − 17
0(/6(&0$ 0(/6(&0$
0(/6(&0$ 0(/6(&0$
MELSEC-A
b5 b4 b3 b2 b2 b1
If the written data is