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Operation
D397-50-880 Issue C
Setpoint On and Off - The setpoint value formats depend on the units selected. Both Pascal's and volts require an
IEEE-754 floating point format number (32-bit). Use of IEEE-754 format to represent floating point numbers is
commonplace in PLCs. A useful conversion tool can be found at the following web address: http://
babbage.cs.qc.edu/courses/cs341/IEEE-754.html.
Percentage speed is a 16-bit integer with the number in 200th's of a percent i.e.50%=10,000(decimal)=2710(hex)
so number entered, for example in SyCon, should be 00002710h.
Enable - Enables or disables control at the chosen setpoint by the chosen master object. If this is set to "disabled"
the configured control link will not function
4.8.22 Software module 916 - Relay 1
General Description
Set-up and monitoring of Relay 1 output.
Output bytes (from Master)
None - No direct user control.
Input bytes (to Master)
No Alerts currently exist for these software modules so the 2nd and 3rd bytes will always be zero.
Associated Parameter options
4.8.23 Software module 917 - Relay 2
General Description
Set-up and monitoring of Relay 2 output.
See Relay 1 for output, input and parameter options.
1st State - 0 = off, 4 = on.
2nd Alert - refer to table in Appendix A2.
3rd Priority - refer to table in Appendix A3.
Bytes Parameter Option Description of Parameter
1st Module number Cannot be changed.
2nd
3rd Controlling item Master object.
4th
5th Units For Master object not
Slave object.
6th Setpoint ON IEEE-754 format for pressure and voltage.
7th
8th
9th
10th Setpoint OFF IEEE-754 format for pressure and voltage.
11th
12th
13th
14th Enable Enables or disables control at the chosen setpoint.
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