
B-62714EN/04 OPERATION 2.LCD-MOUNTED TYPE 16i/18i/21i-A, Power Mate i-D/H
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Communication status for user visual check (when DI/DO MAP MODE = 1
[global I/O transfer])
This status can be displayed by selecting the soft key [STATUS] on
the slave station setting screen (Screen 2-5).
Screen 2-8
(Screen 2-8 shows that the local slave station (#5) and the master
station are communicating with each other normally, and that the
local slave station is performing global I/O transfer with only slave
station #1.)
ERROR STATUS
ERROR STATUS (1 byte):
Communication line errors detected by a slave station are
indicated in hexadecimal.
bit 7bit 6bit 5bit 4bit 3bit 2bit 1bit 0
Bits 7 to 5 : Reserved (0 at all time)
Bit 4 : Abort detection
Bit 3 : CRC error detection
Bit 2 : Overrun error detection
Bit 1 : Detection of data consisting of an incorrect number of bits
Bit 0 : Receive buffer overflow
NOTE
Many errors are caused by hardware failures (on
communication boards or communication cables)
and noise. Recheck the method of communication
cable connection, terminating resistor, and noise
protection.