Johnson Controls 300 Series Manual page 26

26 Network Control Module 300 Series Technical Bulletin
Description
Functionality
(Cont.)
Network Port See the Network Port Technical Bulletin (LIT-6295050).
Application
S2 Migration An NCM with S2 software can connect one JC/85 trunk through one TableTop Modem
(for example, if four trunks originally connected to the JC/85 headend, four NCMs are
required unless the trunks can be reconfigured). The database size of each trunk
determines how much DRAM is required. An NCM with 2 MB of DRAM typically
processes 250-350 objects. Estimating considerations follow.
Countable JC/85 objects:
FPU device
FPU hardware points (the SST101 counts as two objects)
DSC-8500 device
DSC-8500 hardware points
DSC-8500 data points
DSC-8500 status variables
In addition to the memory required by the object count and Metasys software standard
features, also calculate additional memory used for written programs of Graphic
Programming Language (GPL) equivalents to JC/85 features. See How to Use the
Metasys GPL HVAC Library Technical Bulletin (LIT-636121).
Applications of interest to JC/85 users are:
interlocks
computed points
chiller sequencing
Among the considerations about adapting JC/85 code to the Metasys system, here are
two that may adjust the memory requirements:
Auto Shutdown
When converting the JC/85 Auto Shutdown feature, write an equivalent GPL process
for the Metasys system and add the file object size to the NCM's memory usage.
ESO (Enthalpy Switch Over)
When converting the JC/85 ESO feature, you must choose one of the four economizer
features utilized in the Metasys system.
ECONEN Comparison Enthalpy Economizer
ECONOE Outdoor Air Enthalpy Economizer
ECONDB Outdoor Air Dry Bulb Economizer
ECONRA Differential Temperature Economizer
Details and specifications about each of these programs are listed in How to Use the
Metasys GPL HVAC Library (LIT-636121).
Port Configurations: Standard Functionality
Table 11 shows applications and port restrictions when downloading
one of the Standard Functionality software sets (Standard, Fire
Management, Intelligent Access Control, Operator Terminal).
Table 12 shows device restrictions for each port.