Configure The Telegram - Hach SC4500 User Manual

PID control function
Option Description
Error mode Sets the controller to not change the analog output value (Hold) or show the transfer value
on the analog output when an internal error occurs. Options: Hold or Transfer
Mode Sets the output condition when the process value is out of the controlled band. Options:
Direct control or Reverse
Mode Automatic—The output works as a PID controller.
Manual—The output has got an on/off ratio as set in Manual output.
Manual output Additionally the on/off ratio can be set (condition: Mode is set to Manual). Note that this ratio
cannot exceed a value beyond the values set in the Minimum and Maximum menus.
Minimum Sets the lower limit for the output current. Default: 0.1 mA
Maximum Sets an upper limit for the possible output current value. Default: 20.0 mA
Relay setpoint Sets the process value which is controlled by the PID controller.
Dead zone The dead zone is a band around the setpoint. In this band the PID controller does not
change the PWM on/off ratio output signal. This band is determined as setpoint +/- dead
zone. The dead zone stabilizes the PID controlled system which have a tendency to
oscillate.
Proportional Sets the proportional part of the PID controller. Refer to
on page 31.
Integral Sets the integration part of the PID controller.
Derivative Sets the derivative part of the PID controller.
Snap shot Shows the snap shot value.
5. Push OK to apply the changes.
6. Push the main menu icon, then select Outputs > mA outputs > Test/Maintenance.
The Test/Maintenance menu lets the user do a test of the internal plug in the expansion cards.
7. Select an option.
Option
Function test
Output status

6.5.3 Configure the telegram

The industrial communication protocols usually operates with a cyclic transmission of data between
main (master) and secondary (slave) devices on a network. The controller uses Telegram for data
transmission. The content of the Modbus TCP telegram is the same as the Profibus telegram, the
PROFINET telegram and the EtherNet/IP telegram. Configure the telegram settings as follows:
1. Push the main menu icon, then select Outputs > [output source] > Telegram.
2. Select Add device. A list of available devices show.
3. Select the devices to add to the telegram list and push OK.
4. On the Telegram menu, select one device.
5. Select Add tag. A list of available tags for the selected device shows.
6. Select the tags to add to the device and push OK.
7. Push SAVE.
8. To remove a device from the telegram list, do the steps that follow:
a. Go to Outputs > [output source] > Telegram
b. Select - Delete device. A list of available devices shows.
38 English
Description
Does a test on the outputs on the selected module.
Shows the condition of the outputs on the selected module.
Configure the high voltage relays