Resetting when counting (TSX CTY 2A/4A)

At a Glance

Resetting initializes the counting register at zero value.

Resetting is:

triggered
- by the hardware: on the rising or falling edge of the IReset ST_IPRES (%IWr.m.c.2.3) physical input, with the software being pre-enabled, Reset enable ENAB_IPRES (%Qr.m.c.6) command,
- directly by the software: Direct reset DIR_PRES command (Qr.m.c.2),
automatic, will be done when the zero value is crossed.

NOTE: the IReset input is physically the same as the IPres ST_IPRES (%IWr.m.c.2.3) input used for presetting in down counting mode.

The diagram block of the Reset function is the same as that of the function for Preset.

NOTE: the two types of Reset (triggered and automatic) are independent and can co-exist.

Time diagrams

The following figures show examples of triggered and automatic resetting to zero:

The time diagram below shows both a triggered reset on the rising edge of the IReset input, and a direct (software) reset. The high setpoint is crossed without automatic reset. The associated language objects are described in the default objects section.

The time diagram below shows a triggered reset on the rising edge of IReset input, a direct (software) reset and an automatic reset when crossing the high setpoint.