1. NeSSI Sensor Actuator Connectivity Rick Ales Sep, 2001 1
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2. Proposed NeSSI Topology
Analyzer Server & Workstation
Level Control Link
NeSSI Link,
Sensor/Actuator Bus, used to connect low-level, smart devices
Control System
RAMAN, NIR etc.
GP Area
Fiber-Optic Sensor.
Level Analyzer Link
Field WH P A V T P A V T P A V T
Level 0 NeSSI Link
Wireless Link
Modular Sampling System Initiative
Pittcon: March 7, 2001
Presented by Rob Dubois of Dow Chemical at PittCon 2001 2
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3. NeSSI Link 0 RequirementsP A V T
Open System
Industry Standard
Proven Commercial Success
Cheap (Low cost of ownership)
Smart features.
Robust
Small 3
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4. * Technical Issues (not critical) Determinism Master/Slave
* Engineering Concept
(not critical)
(typical application)
(in some cases)
(node-2-node < 10m)
(Class 1 Div 1 & Div 2)
Determinism
Master/Slave
Multi Master
Distance
Speed
Hazardous Area 4
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5. OSI Communications Model5
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6. Physical Layer Connectors Field wires Filter Isolation Class 1 Div 2
Nonincendive
Class 1 Div 1
IEC 6
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7. Data Link Layer Single Chip Solution Communication Controller
CPU, RAM, Flash & EEPROM
A/D, D/A, Discrete I/O
Provides Compatibility 7
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8. Application Layer Software Download to Common Hardware Platform
Could be Multi Vendor:
DeviceNet
SDS
IEC 1131 Derivative
Provides Interoperability 8
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9. NeSSI Sesnor Actuator Connectivity... ... Keep it Simple 9
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