Mitsubishi MELSEC Q Series Programming Manual page 122

(2) Device data check
Device data checks for the devices used by basic instructions and application instructions in
CPU module are as indicated below:
(a) When using BIN data
(b) When using BCD data
(c) When using floating-point data
(d) Using character string data
(3) Buffer memory access
For accessing buffer memories, using instructions with intelligent function module devices
(from Un\G0) is recommended.
(4) Multiple CPU shared memory access
For accessing multiple CPU shared memories, using instructions with multiple CPU shared
devices (from U3En\G10000) is recommended.
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No error is returned even if the operation results in overflow or underflow. The carry flag
does not go on at such times, either.
1) Each digit is check for BCD value (0 to 9). An operation error is returned if individual
digits are outside the 0 to 9 (A to F) range.
2) No error is returned even if the operation results in overflow or underflow. The carry
flag does not go on at such times, either.
1) An operation error occurs when the following operation results are returned with the
single-precision floating-point operation instruction.
When the absolute value of the floating decimal point data is 1.0
When absolute value of floating decimal point data is 1.0
2) An operation error occurs when the following operation results are returned with the
double-precision floating-point operation instruction.
When the absolute value of the floating decimal point data is 1.0
When absolute value of floating decimal point data is 1.0
No data check is conducted.
-127
2 or lower
128
2 or higher
-1023
2 or lower
1024
2 or higher