IDEC High Performance Series - Manual (Page 34)

1 WindO/I-NV2 Specifications
2-4 WindO/I-NV2 User’s Manual
Data type Storing 1234 (hex) in LDR10 Storing F765 (hex) in LDR10
BCD4
The sign is 1 (hex), so the binary-coded decimal
value of the positive number 234 (hex),
handled as 1234 (dec).
The sign is F (hex), so the binary-coded decimal
value of the negative number 765 (hex),
handled as -765 (dec).
Data type
Storing 5678 (hex) in LDR10, 1234 (hex) in
LDR11
Storing F765 (hex) in LDR10, 4321 (hex) in
LDR11
BCD8
The sign is 1 (hex), so the binary-coded decimal
value of the positive number 2345678 (hex),
handled as 12345678 (dec).
The sign is F (hex), so the binary-coded decimal
value of the negative number 7654321 (hex),
handled as -7654321 (dec).
Data type Storing 0000 (hex) in LDR10, BFA0 (hex) in LDR11
float32
In the data types BIN32 (+), BIN32 (+/-), BCD8, and float32, two words (upper word and lower word) are
used for a single value. The MICRO/I and host device communicate data in device addresses in one word
units, so when the upper word and lower word are sent in separate packets, the value may have already
changed when the data for both words is received, which may cause an unexpected result.
bit bit
15 0
234 (Hex)
LDR10
+
0001001000110100
bit bit
15 0
765 (Hex)
LDR10
−
1111011101100101
bit
0
bit
31
2345678 (Hex)
LDR10 LDR11
+
00010010001101000101011001111000
bit
0
bit
31
7654321 (Hex)
LDR10 LDR11
−
0001 0010 0011 0100 0101 0110 0111 1111
bit bit
22 0
bit
31 bit
23
Exponent
LDR10 LDR11
Sign Significand
10111111101000000000000000000000
0000 (Hex) BFA0 (Hex)
1 01000000000000000000000 01111111
2 -2 = 0.25 2 0 +2 1 +2 2 +2 3 +2 4 +2 5 +2 6 = 127
Negative
−1.25Ч2 127-127 = −1.25