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1-7GFK-0804B Chapter 1 Programming for the Micro PLC
Special Coils
The Micro PLC provides three special-purpose coils:
0.1 sec clock
start–up scan coil
hold output coil
0.1 Sec Clock (C1018)
Coil C1018 is a pulse generator. The pulse width is shown below. This coil is a read-only
coil. It can only be used as a program input, not as an output.
Pulse
signal
50msec
0.1 sec
46103
This coil should be used as a one-shot contact that feeds a regular coil.
Start-up Scan Coil (C1019)
When the controller starts operating, this coil goes ON for one scan. It is a read-only coil.
It can only be used as a program input, not an output.
Run/power on
1 Scan
Stop/power off
46104
Hold Output Coil (C1021)
This coil can be used to control the state of the program outputs when the PLC is put in stop
mode. As a group, all of the outputs can either hold their last state, or be set to OFF.
If all outputs should hold their last state, set coil C1021 to ON (1).
If all outputs should be set to OFF, set coil C1021 to OFF (0).
Note: This function takes precedence over the Clear Data function of the programming
software (key F7 in the Online menu).