Appendix B. Pump Control from a PLC

Appendix B. Pump Control from a PLC

This guide shows how to use the information in Appendix A to control a pump remotely from a PLC. The steps progress from basic pump control to more advanced monitoring and alarm control features.

It is important that you first follow all directions in the Setup Screens to configure your system properly. Test that the pump operates correctly when controlled from the Display. Make sure the display, fiber optics, communication gateway, and PLC are connected properly. Refer to Communication KIt manual. Use Setup Screen 12 to enable remote control and set your modbus preferences.

1.Enable PLC control: Set register 404200 to 1.

2.Run a pump: Set register 404201. Enter 0 for stopped,1 to 4 for the desired profile.

3.View pump profile: Read register 404201. This register updates automatically to reflect the actual pump status. If the profile is changed from the display, this register changes as well. If the pump stops due to an alarm, this register will read 0.

4.View pump status: Read register 404100 to see the status of the pump. See Appendix A, Table 6, for a description of each bit.

•Example 1: Register 404100, bit 1, reads 1 if the pump is currently moving.

•Example 2: Register 404100, bit 2 reads 1 if the pump has an active alarm.

5.Monitor alarms and deviations: Read register 404112 to 404115. Each bit in these registers corresponds to an alarm or deviation. See Appendix A, Table 5. I

•Example 1: Pressure falls below the minimum setting entered on Setup Screen 2. It will show on bit 4 of register 404113 if minimum pressure is set to Alarm, and on bit 5 of register 404113 if minimum pressure is set to Deviation.

•Example 2: The system is set up for a pressure transducer on Setup Screen 8, but no transducer is detected. It will show on bit 1 of register 404114.

6.Monitor pump cycle rate, flow rate, and pressure: Read registers 404101 to 404105. Note that pressure is available only if a pressure transducer is connected to the display. Register 404104 shows the pressure on transducer 1. Register 404105 shows the pressure on transducer 2. See Appendix A, Table 7 for units for these registers.

•Example 1: If register 404101 reads 75, the pump speed is 7.5 cycles/minute.

•Example 2: If register 404103 reads 67, the pump is operating at 67 percent pressure.

7.Reset active alarms and deviations: Clear the condition that caused the alarm. Set register 404202, bit 0, to 1 to clear the alarm. The pump will be in profile 0 due to the alarm. Set 404201 to the desired profile to run the pump again.

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Graco 24P822 important safety instructions Appendix B. Pump Control from a PLC
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24P822 specifications

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