Preset - Mitsubishi Electric MELSEC-L02SCPU User Manual

8.4.1

Preset

This function overwrites CH1 Current value (SD1880, SD1881) with a value set to Preset value write instruction
(ICPREWR1(P)) (preset value) and counts pulses starting from the set value ( Page 245, Section 8.10.1 (3)). The
following methods are available.
• Preset by phase Z input
• Preset by a program
• Preset by the preset at coincidence output function ( Page 207, Section 8.4.2 (1))
• Preset by the count disable/preset function ( Page 217, Section 8.4.4 (2) (d))
• Preset by the latch counter/preset/replace function ( Page 219, Section 8.4.4 (2) (e))
This section describes preset by phase Z input and preset by a program.
(1) Z phase settings
(a) Z phase (preset) trigger setting
Select a trigger condition to perform the preset function by phase Z input from the following.
(b) External preset (Z phase) request detection setting
When performing the preset function by phase Z input, select whether to turn on CH1 External preset (phase Z)
request detection (SM1886). This setting is invalid if "Z Phase (Preset) Trigger Setting" is set to "During ON".
Select either of the following items.
• ON at detection
• Not ON at detection
• Precautions
While CH1 External preset (phase Z) request detection (SM1886) is on, the current value cannot be
replaced with the preset value by any method. In this case, turn off this relay by turning on CH1 External
preset (phase Z) request detection reset command (SM1897).
202
Rising edge
Phase Z
Rising edge +Falling edge
Phase Z
Falling edge
Phase Z
During ON
Phase Z