Standard function blocks

CNT2_CTR (FC 2)

Control of software gates and digital outputs of the FM 350-2

CNT2_WR (FC 3)
CNT2_WRPN (FB 3)

Write counter values, limits and comparison values to the FM 350-2

CNT2_RD (FC 4)
CNT2_RDPN (FB4)

Read out current count and measurement values from the FM 350-2 (for four channels each)

DIAG_RD (FC 5)

for provision of diagnostics information of the FM 350-2 in event of diagnostics interrupt

Operating modes

Continuous counting

After the gate has been enabled, counting is performed continuously (beginning with the starting value) between the upper and lower limits.

Count once

After the gate has been enabled, counting is performed once (beginning at the starting value) to the upper or lower limit depending on the main count direction.

• Main count direction upwards: from 0 up to the parameterizable full-scale value

• Main count direction downwards: from the parameterizable start-of-scale value down to 0

Periodic count

After the gate has been enabled, counting is performed periodically (beginning at the starting value) within the parameterized counting range depending on the main count direction.

• Main count direction upwards: periodically from 0 up to the parameterizable full-scale value 1

• Main count direction downwards: periodically from the parameterizable start-of-scale value down to 1

Frequency counting

After the gate has been enabled, all the pulses received within a parameterizable time frame are counted and the frequency is determined from this.

Speed measurement

After the gate has been enabled, all the pulses received within a parameterizable time frame are counted and the speed is determined from this.

Cycle duration measurement

After the gate has been enabled, all the pulses received within a parameterizable time frame are counted and the period is determined from this.

Dosing

4 counter channels are combined to form one proportioning channel. After the gate has been enabled, proportioning is performed once (beginning at the starting value) to the upper or lower limit depending on the main count direction.

• Main count direction upwards: from 0 up to the parameterizable full-scale value

• Main count direction downwards: from the parameterizable start-of-scale value down to 0

Failure responses

Description

Cancellation

The outputs are switched off immediately, the counting/measuring processes are canceled.

Continue

The module continues counting/measuring unchanged, even after a restart of the CPU

Switch to substitute value

Active counting/measuring processes are cancelled. The module applies the configured substitute values at the outputs, channel by channel.

Keep last value

Active counting/measuring processes are cancelled. The module's outputs are frozen in the state they had immediately before canceling.