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Page 35
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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.
