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3. PROCEDURE UP TO DATA COMMUNICATIONS DESCRIBED IN THIS
GUIDEBOOK
MELSEC QnA
1
Self loopback test check contents
1
T
T
Check Item
Check Contents
Noma1 Display
Error Display
Notes
-
ON
' C CPU commu-
lications check
:hecks the functions that
:ommunicate with the PC
:pu.
CH1-C'N
I
OFF
CH 1 -C/N
CPURW Light dimly
PC CPU
AJ71 QC24
CHI
-NEU,
Blink
ACK, NAK sequentially
>H1 (RS-232C)
:ommunications
:heck
:hecks the CHI
R S -
!32C interface send and
eceive functions.
CHI
.ERR
ON
I
Blink
;H2(RS-422/485)
:ommunications
:heck
:becks
the CH2 RS-422/
I85
interface send and
eceive functions.
CH2.ERR
ON
CH2-SD
I
Blink
1
CH2-RD
*The tests continue even if an error occurs in any of the check items.
@
Ending the tests
(1) Turn OFF the power.
(2) Disconnect the cable and connect the cable to communicate with the external
device.
(3) Change the setting
of
the mode switches.
CH1: "1
"
(dedicated protocol format 1) / "6" (non procedure protocol) / "7"
bidirectional protocol)
CH2: "1"
3 - 7
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