Endress+Hauser Proline Prosonic Flow 93 - Page 183

PROline Prosonic Flow 93 FOUNDATION Fieldbus 5 Discrete Output function block
Endress+Hauser 183
Input allocation of the CAS_IN_D, RCAS_IN_D, OUT_D, SP_D parameters
Example for the control of positive zero return via the Discrete Output function
block.
The following example shows how the positive zero return for channel 1 can be
activated or deactivated by an upstream function block via the Discrete Output function
block during a cleaning procedure.
1. In the first step, the connection between the Discrete Output function block and the
Transducer Blocks must be established. For this, the value "16" (= Discrete Output)
must be assigned to the CHANNEL parameter.
2. In the CAS operating mode, the Discrete Output function block processes the
setpoint value prescribed at the CAS_IN_D input from an upstream function block
and transfers it to the Transducer Blocks.
Activating the positive zero return, channel 1
With a starting value of 0 (Discrete state 0), the positive zero return is activated by a
status change from 0
→ 2 at the CAS_IN_D input.
Deactivating the positive zero return, channel 1
The positive zero return for channel 1 can only then be deactivated when the input
value at CAS_IN_D has first been set to output value 0 (Discrete state 0). Only then
can the positive zero return be deactivated again through a status change from
0
→ 3 at the CAS_IN_D input.
Status changes Action
Discrete state 0
→
Discrete state 1 Reserved
Discrete state 0
→
Discrete state 2 Positive zero return channel 1 “ON”
Discrete state 0
→
Discrete state 3 Positive zero return channel 1 “OFF”
Discrete state 0
→
Discrete state 4 Zero point adjustment channel 1
Discrete state 0
→
Discrete state 5 Reserved
Discrete state 0
→
Discrete state 6 Reserved
Discrete state 0
→
Discrete state 7 Reset totalizers 1, 2, 3
Discrete state 0
→
Discrete state 8 Reset totalizer 1
Discrete state 0
→
Discrete state 9 Reset totalizer 2
Discrete state 0
→
Discrete state 10 Reset totalizer 3
Discrete state 0
→
Discrete state 11 Reserved
Discrete state 0
→
Discrete state 12 Reserved
Discrete state 0
→
Discrete state 13 Reserved
Discrete state 0
→
Discrete state 14 Reserved
Discrete state 0
→
Discrete state 15 Reserved
Discrete state 0
→
Discrete state 16 Positive zero return channel 2 “ON”
Discrete state 0
→
Discrete state 17 Positive zero return channel 2 “OFF”
Discrete state 0
→
Discrete state 18 Zero point adjustment channel 2