20: PULSE INSTRUCTIONS
« FC4A MICROSMART USER’S MANUAL » 20-27
Timing Chart for Zero-return Operation
This program demonstrates a timing chart of the ZRN1 instruction when input I2 is used for a high-speed deceleration
input.
D1
M10
I0
ZRN
1
S1
D200
Output Pulse Q0
Deceleration Input I2
Start Input I0
• When input I0 is turned on, ZRN1 starts to generate output pulses of the initial pulse frequency designated by the
value stored in data register D201. While the output pulses are sent out from output Q0, internal relay M10
remains on.
• When deceleration input I2 is turned on, the output pulse frequency immediately reduces to the creep pulse fre-
quency designated by the value stored in data register D203.
• When deceleration input I2 is turned off, ZRN1 stops generating output pulses immediately. Then internal relay
M10 turns off, and internal relay M11 turns on.
• If parameter values in D200 through D203 are changed while generating output pulses, the change takes effect
when start input I0 is turned on for the next cycle.
• If start input I0 is turned off while generating output pulses of either initial or creep pulse frequency, ZRN1 stops
generating output pulses, then internal relay M10 turns off and internal relay M11 turns on. When input I0 is
turned on again, ZRN1 restarts to generate output pulses for another cycle, starting at the initial pulse frequency.
• If deceleration input I2 is already on when start input I0 turns on, ZRN1 star ts to generate pulse outputs of the
creep pulse frequency.
Pulse Output ON M10
Pulse Output Complete M11
S2
I2
Initial Pulse Frequency
Creep Pulse Frequency
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