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CHAPTER6 FUNCTIONS
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6.23 Serial Communication Function
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(3) Functions
Table6.40 shows the MC protocol commands that can be executed by the serial communication function.
*1: When writing data while the CPU module is in the RUN status, set "RUN write setting" to "Permit".
*2: Set the number of processing points within the range of the following calculation formula.
(number of word access points) 12 + (number of double word access points) 14 960
• One point of a bit device corresponds to 16 bits for word access or to 32 bits for double word access.
• One point of a word device corresponds to one word for word access or to two words for double word access.
Table6.40 MC protocol commands supported by the serial communication function
Function Command Processing
Number of processing
points
Device
memory
Batch read
In units of
bits
0401(00
1)
Reads bit devices in units of 1 point.
ASCII: 3584 points
BIN: 7168 points
In units of
words
0401(00
0)
Reads bit devices in units of 16 points. 480 words (7680 points)
Reads word devices in units of 1 point. 480 points
Batch write
*1
In units of
bits
1401(00
1)
Writes bit devices in units of 1 point.
ASCII: 3584 points
BIN: 7168 points
In units of
words
1401(00 0)
Writes bit devices in units of 16 points. 480 words (7680 points)
Writes word devices in units of 1 point. 480 points
Random read
In units of
words
0403(00
0)
Reads bit devices in units of 16 points or 32 points
by specifying the device or device number at
random.
96 points
Reads word devices in units of 1 point or 2 points by
specifying the device or device number at random.
Test
*1
(random write)
In units of
bits
1402(00
1)
Sets/resets bit devices in units of 1 point by
specifying the device or device number at random.
94 points
In units of
words
1402(00
0)
Sets/resets bit devices in units of 16 points or 32
points by specifying the device or device number at
random.
*2
Writes word devices in units of 1 point or 2 points by
specifying the device or device number at random.
Monitor
registration
In units of
words
0801(00
0)
Registers bit devices to be monitored in units of 16
points or 32 points.
96 points
Registers word devices to be monitored in units of 1
point or 2 points.
96 points
Monitor
In units of
words
0802(00
0)
Monitors devices registered for monitoring.
Number of monitor
registration points