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Default System Tags
Note: Please do not attempt to modify read only system tags in the ladder. This could affect the functionality of
the product.
System Registers / Coils:
Register / Coil
Tag
Name Read / Write Description
SW0003_14 COM1 Status Read Only 0 = Communication Error; 1= Communicating
with PLC
SW0003_15
COM2 Status
Read Only
0 = Communication Error; 1= Communicating
with PLC
S0000
Carry Bit
Read/Write
Overflow indication in math operations of ladder
and also used in rotate with carry instruction.
SW0010
RTC Day of Month
Read only
RTC day in integer format
SW0011
RTC Month
Read only
RTC month in integer format
SW0012
RTC
Year
Read only
RTC year in integer format
SW0013
RTC Hour
Read only
RTC hour in integer format
SW0014
RTC Min
Read only
RTC minute in integer format
SW0015
RTC Sec
Read only
RTC sec in integer format
SW0016
RTC Day of Week
Read only
RTC day of week in integer format
SW0017
Scan time register
Read only
Value is in multiple of 0.1 mSec. This includes
execution time for reading inputs, executing
tasks, executing ladder, update outputs, etc.
(Refer flow chart)
S0019
Invalid RTC date entry
Read only
0=valid date 1= Invalid date
SW0018
COM1 failed node reconnect
time (Sec)
Read/write
Shows time in sec recover the communication
with failed nodes for port1.the default value is
60Sec
SW0019
COM2 failed node reconnect
time (Sec)
Read/write
Shows time in sec recover the communication
with failed nodes for port1.the default value is
60Sec
SW022
COM3 failed node reconnect
time (Sec)
Read/write
Shows time in sec recover the communication
with failed nodes for port3.the default value is
60Sec
S0021
COM1 failed node reconnect
control
Read/write
If this bit is set communication with the failed
nodes is detected after scan time SW0018 for
port1.By default : ON
S0022
COM2 failed node reconnect
control
Read/write
If this bit is set communication with the failed
nodes is detected after scan time SW0019 for
port2.By default : ON
S0023
COM3 failed node reconnect
control
Read/write
If this bit is set communication with the failed
nodes is detected after scan time SW0022 for
port3.By default : ON
SW64-SW65
Node Status Registers for
COM1
Read only
Shows the status of the node, whether node is
present or
not.
Total 2 word Register are mapped
for 32 nodes.
SW80-SW81
Node Status Registers for
Read only
Shows the status of the node, whether node is
COM2 present or not. Total 2 word Register are
mapped for 32 nodes.
SW96-SW111
Node Status Registers for
Read only
COM3
Shows the status of the node, whether node is
present or
not.
Total 16 word Register are
mapped for 256 nodes.
(Not applicable for non-Ethernet models)