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Appendix Special soft components
Appendix mainly introduces the functions of XD/XL series PLC special soft element, data
register, FlashROM and the address distribution of expansions for users to search.
Appendix 1．Special Auxiliary Relay
SM000 keeps ON
when PLC running
SM001 keeps OFF
when PLC running
Initial positive pulse
coil
SM002 is ON in first
scan cycle
Initial negative pulse
coil
SM003 is OFF in first
scan cycle
When SM4 sets ON, it indicates that there is an error
in the operation of PLC.
(Firmware version V3.4.5 and above supports this
function by PLC)
When the battery voltage is less than 2.5V, SM5 will
put ON (at this time, please replace the battery as soon
as possible, otherwise the data will not be maintained)
Power-off memory
data error
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