I/O addresses are configured in MetsoDNA I/O Modules. For the inputs, use the same PIC (I/O Rack) and Card addressing as in the first exercise! For I/O channel addresses use the paragraph numbers below (1..7)!

1. Indicator Light "IN"
• Indicator light on the local control panel
• the light is constantly lit, when the soot blower is at the "IN" limit
• the light blinks at 1 Hz when the soot blower is retracting (i.e. moving towards "IN" limit)
2. Indicator Light "OUT"
• Indicator light on the local control panel
• the light is constantly lit, when the soot blower is at the "OUT" limit
• the light blinks at 1 Hz when the soot blower is moving out
3. Indicator Light "DISCR"
• Indicator light on the local control panel
• The light blinks at 1 Hz to indicate a discrepancy alarm
• Blinking stops, when the alarm has been acknowledged by pushing "ACKNOWLEDGE" button
• Travelling Time Discrepancy = the soot blower does not reach it's limit switch during 20 s of continous control
• Limit Switch Discrepancy = both "IN" and "OUT" limit switches are closed at the same time
• The soot blower is retracted if there is any type of discrepancy
4. Indicator Light "STEAM"
• Indicator light on the local control panel
• Lit whenever steam flow sensor switch is closed
• Failure indication:
  • If steam flow is abrupted while the soot blower is not at the "IN" limit, he light starts to blink at 2 Hz to indicate a steam failure
  • "ACK" button is pushed -> light continues to blink, now at 1 Hz
  • Steam begins to flow or "IN" limit switch is activated -> light stops blinking and indicates status of the steam sensor
  • If steam failure clears out, but "ACK" button is not pushed, light keeps on blinking at 2 Hz. Now, pushing "ACK" button results in the light indicating the status of the steam sensor.
• The soot blower is retracted if there is any type of discrepancy
• See a sample application which can be applied to facilitate 2 and 1 Hz blinking as well as constant illumination of the indicator light
5. "EC IN" ###XSC105
• Contactor output to Electric Centre
• Electric center will power to the soot blower motor when this output is activated causing it to move inwards
• Output has to be activated as long as the soot blower is supposed to move
6. "EC OUT" ###XSC106
• Contactor output to Electric Centre
• Electric center give power to the soot blower motor when this output is activated causing it to move outwards
• Output has to be activated as long as the soot blower is supposed to move
7. "STEAM VALVE"
• Contactor output to steam valve
• The valve opens up when this output is active and closes down as soon as the output is deactivated
• Has to be activated as soon as "START" button has bee pushed
• Should be deactivated as soon as the soot blower reaches "IN" limit