Status relays S and HS are very import in ladder program; they are used together with
instruction “STL” in the flow. The flow can make the program clear and easy to modify.
For common use
After shut off the PLC power, S relays will be OFF
For Power Off Retentive Use
HS relays can keep the ON/OFF status even PLC power is off
The status relays also have countless “normally ON/OFF” contactors. So users can use them
freely in the program.
Note: The range of soft components mentioned above is the valid range of PLC in the X-NET
communication mode. In the MODBUS communication mode, some relays can not read and
write. The specific usable range is shown in chapter 6-2-3.
2-7．Timer (T, HT)
The timer addresses of XD/XL series PLC are in the form of decimal; please see the
following table:
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