Endress+Hauser Liquiline CM44P - 10.5 Binary inputs and outputs

Liquiline CM44P Operation
Endress+Hauser 95
10.5 Binary inputs and outputs
Hardware options, such as the "DIO" module with 2 digital inputs and 2 digital outputs or
fieldbus module "485" enable the following:
• Via a digital input signal
• measuring range switching for conductivity (upgrade code required, →  182)
• switching between different calibration datasets in the case of optical sensors
• external hold
• a cleaning interval to be triggered
• PID controller switch-on/switch-off, e.g. via the proximity switch of the CCA250
• the use of the input as an "analog input" for pulse-frequency modulation (PFM)
• the setting of the optical zero point or a manual offset for photometer sensors
• Via a digital output signal
• diagnostic states, point level switches, or similar states transmitted statically (similar
to a relay)
• the dynamic transmission (comparable to a non-wearing "analog output") of PFM
signals, e.g. to control dosing pumps
10.5.1 Application examples
Chlorine regulation with feedforward control
CCA250
CM44x / CM44xR
Flow, e.g. Promag53
A
BU
BK
BN
CCA250
INS
47
48
91
92
CM44xX
DIO
1
2
3
Dig.in
CM44xX: DIO
Dig.in: PFM
91
92
+
–
45
46
CM44xX
DIO
Dig.out: PFM
A0028316
 84 Example of chlorine control with feedforward control
1 Connection of the inductive proximity switch INS of CCA250 to the digital input of the DIO module
2 Connection of the signal from a flowmeter to the digital input of the DIO module
3 Activation of a (pulse) dosing pump via the digital output of the DIO module
A Dosing pump