Specifications
7. Application Instructions
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7-69
Flag Function explanation
M1123 Receive completed
M1124 Receive waiting message
M1125 Receive status disable
M1126 STX/ETX system definition selection
M1127
MODRD / RDST / MODRW commands data receive
completed
M1128 Transmitting/receiving indication
M1129 Receive time out
M1130 Users/system definition STX/ETX
M1131
MODRD / MODWR / MODRW data convert to HEX,
M1131=ON
M1140 MODRD / MODWR / MODRW data receive error
M1141 MODRD / MODWR / MODRW command parameter error
M1142 VFD-A convenience command data receive error
M1143 ASCII / RTU mode selection, ON is RTU mode
Special
register
Function Explanation
D1038
Time setting for data response delay when PLC is slave.
Time unit is 0.1ms.
D1070~
D1085
It is PLC built-in RS-485 communication convenience
command. This command will send messages during
executing and if the receiver receives, it will return
messages and save it in D1070~D1085. Users can view
return data by this register content.
D1120 RS-485 communication protocol
D1121 PLC communication address
D1122 Remainder characters of delivery data
Special
register
Function Explanation
D1123 Remainder characters of received data
D1124
Start text definitionΰSTXα
D1125
Definition of the first end characterΰETX1α
D1126
Definition of the second end characterΰETX2α
D1129
Communication time out abnormal. Time unit:ΰmsα
D1130 Return fault code record of MODBUS
D1256~
D1295
This is PLC built-in RS-485 communication convenience
command MODRW. The message that this command sends
during executing will be saved in D1256~D1295. User can
check according to this register content. (In version 4.9, you
can use MOV, DMOV, BMOV to move the data in this area.
D1296~
D1311
PLC will convert ASCII saved in the register that users
indicate to hexadecimal. (In version 4.9, you can use MOV,
DMOV, BMOV to move the data in this area.)
D 224
230
LD
Ϡ
S1 S2
The contact type comparison LD
Ϡ
Bit device Word device
Device
Operand
XYMS K H
KnX KnY
KnM
KnS
TCDE F
S1
ϨϨϨϨϨϨϨϨϨϨϨ
S2
ϨϨϨϨϨϨϨϨϨϨϨ
Ϡ : =, >, <, <>, Љ, Њ
Compare the contents of
S1
and of
S2
. To take ”LD=” as an
example, if the comparison result is “=” , the contact is in continuity, and
if it is “Ћ” , the contact is in discontinuity. The LDϠ command could
connect directly with the BUS.