Colormetry CMU 324

Function | Commissioning | Service
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Operation with PLC-Controller

 

DOWNLOAD_PDF | Colormetry-CMU-324_PLC_timing_remote signal

 

 The analytical device Colormetry may be operated dependent on the release by a remote signal of a higher-level controller.

→ if the remote signal is ENABLED, the Colormetry proceeds monitorings in the set intervals

→ if the remote signal is DISABELED, the Colormetry switches to STAND-BY-MODE and proceeeds no analysis

If the interval time is set ZERO in the parameter settings of the Colormetry device and the remote signal is ACTIVE [release ENABLED], the Colormetry proceeds one monitoring after the other.

By CUTTING OFF the remote signal [release DISABLED] during a monitoring, this analysis will be carried out to the end and a new monitoring result will be issued.

That way, the PLC may trigger the timing of analysis intervals according to the process requirements. Colormetry becomes the slave of the PLC.

In conjunction with the converter box (optional equipment) the monitoring result will be send to the 0/4-20 mA current interface of the converter box.

IMPORTANT

the remote signal must be ACTIVE until the end of the rinsing phase of the monitoring interval, so that the Colormetry issues a new monitoring result 

⇨     please refer to the graphic below    

➢    during the rinsing phase the output “water passing” on terminal clamps 5+6 of the Colormetry device is active  |→ feedback to PLC

 

Relationship between monitoring result and remote signal

When the Colormetry starts monitoring by the request of an external remote signal, but the external remote signal is CUT OFF during the rinsing phase of an analysis interval, the result display varies depending on the monitoring result.

 

example ①

example ①
When concentration abnormalities are monitored (which means monitoring hard water)

Because the remote signal is interrupted during the rinsing phase and the water in the monitoring tank inside the Colormetry may be stagnant, this monitoring is invalid.

→ Result: No alarm, No communication with the conversion box  |  the last result is displayed in the Colormetry device

example ②

example ②
If the device error (poor chemical injection, etc.) occurs during the self-check

Because the remote signal is interrupted during the rinsing phase and the water in the monitoring tank inside the Colormetry may be stagnant, this monitoring is invalid.

→ Result: No alarm, No communication with the conversion box  |  the last result is displayed in the Colormetry device

example ③

example ③
When soft water of applicable range is monitored

Even though the remote signal is interrupted during the rinsing phase, if the monitored concentration is under the applicable range, this monitoring is valid.

→ Result: Monitoring result recorded, Communication On  |  the current monitoring result replaces the last monitoring result

 

Colormetry CMU 324 timing PLC connection 001

 

 

 

COLORMETRY and CONVERTER BOX

 

specification of the 0/4-20 mA current loop interface

The current value of the conversion box 0/4-20 mA current loop interface varies depending on the result of the Colormetry monitoring.

  • if the measured value is   0mg / L [0 …0,05°dH] ,  the output is  4 mA
  • if the measured value is   5mg / L [0,25°dH] and more , the output is 20 mA
  • when no monitoring [no result] or device error occurs the output is  0 mA

Colormetry CMU 324 current loop interface HE 0

 

converter box settings

operation mode:                                 mode MIURA stand alone

input voltage:                                      AC100V … AC240V (connected from outlet)

output valtage:                                    DC24V (connected to Colormetry CMU)

terminal connector X3:                      connected as specified in the conversion box specification chapter 7.5.3
                                                           → converterbox | terminal connection | colour code terminal X3  

digital input X2S1-S2:                        for testing purposes, connect a manual switch between Signal DIO and GND

 

Test ① |  remote signal NO TURNING OFF

Test ① |  remote signall NO TURNING OFF

Self-check with hard water, automatic monitoring

NO TURNING OFF the remote signal until the end of monitoring

→ Display:                      5 mg / L     

→ Analog current:           20 mA

Test ② |  remote signal TURN OFF

Test ② |  remote signal TURN OFF

Self-check with hard water, automatic monitoring

TURN OFF the remote signal immediately after start monitoring *)

→ Display:                      Previous monitoring result 

→ Analog current:           Previous output value

*) Monitoring is invalid, No record, No communication

 

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