Emerson Vilter VilTech - Page 9

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Low Intermediate Pressure (Two Stage)............................................................................................................................. 140
Discrete Alarms .................................................................................................................................................................. 140
APPENDIX B ............................................................................................................................................... 141
Analog and Discrete I/O .................................................................................................................................................... 141
Analog Inputs.................................................................................................................................................................... 141
APPENDIX C ............................................................................................................................................... 143
Communication Protocols .................................................................................................................................................. 143
Introduction ....................................................................................................................................................................... 143
Applicable Documents ...................................................................................................................................................... 143
Hardware Interface Description ......................................................................................................................................... 144
Hardware Requirements ..................................................................................................................................................... 144
Interface Connections........................................................................................................................................................ 144
Pin Name ............................................................................................................................................................................ 144
Message Addressing ......................................................................................................................................................... 146
Software Interface Description .......................................................................................................................................... 148
Protocol Overview ............................................................................................................................................................. 148
Status Only or Status and Control Options ....................................................................................................................... 148
Message Categories .......................................................................................................................................................... 148
MODBUS Protocol Description ......................................................................................................................................... 149
Preset Single Register ........................................................................................................................................................ 150
Preset Multiple Registers ................................................................................................................................................... 150
Error Messages .................................................................................................................................................................. 151
Data Formats ...................................................................................................................................................................... 151
Status Message Description .............................................................................................................................................. 152
Analog Input and Computed Parameters ........................................................................................................................... 152
Discrtete Input and Outputs .............................................................................................................................................. 153
Alarm and Failure Data ...................................................................................................................................................... 154
Equipment Data.................................................................................................................................................................. 157
Alarm Status Table ............................................................................................................................................................. 157
Compressor Mode Table .................................................................................................................................................... 157
Compressor State Table ..................................................................................................................................................... 158
Last RECIP Start Status Table ............................................................................................................................................ 160
Control Message Description ............................................................................................................................................ 160
Network in Control Command ............................................................................................................................................ 161
Compressor Start/Stop ....................................................................................................................................................... 161
Set Comressor Capacity Command .................................................................................................................................... 162
Change Compressor Mode Command ............................................................................................................................... 162
Acknowledg/Clear Active Alarm Command ....................................................................................................................... 163
Change Current Setpoint Group Command ........................................................................................................................ 163
Change Control Type Command ........................................................................................................................................ 163
Auto Start/Stop Contol Command ..................................................................................................................................... 163
Suction Pressure Setpoint Message Description............................................................................................................... 164
Process Temperature Setpoint Message Description ........................................................................................................ 165
APPENDIX D ............................................................................................................................................... 166
Condensor Control ............................................................................................................................................................ 166