Category: Emerson

LSN Description and Specification

The SZ controllers and CSLSs can be physically connected

as a star topology (the LSN does not support network

ring topologies).

Starting with DeltaV SIS v13. the LSN Bridge (LSNB) allows

communication across multiple LSNs. The LSNB connect

to the LSN following a star topology.

Refer to the latest DeltaV SIS Installation and Planning Guide

for details of network layouts and network cable shielding

requirements and power and grounding requirements for

the overall DeltaV SIS system.

A redundant CSLS communicates over the LSN with up to

15 other CSLSs, 1 SZ controller, and 1 LSNB allowing great

flexibility and ease of system expansion.

Only DeltaV SIS Smart Switches are supported on the LSN.

The LSN is certified according to the concept of black channel

per IEC61508-2. Therefore, the LSN hardware components

are considered as an interference free hardware component of the SIS.

Scalable in small increments. You can expand the system

readily and economically by adding hardware incrementally

to your system. Just plug another CSLS into the LSN and it is

recognized by the system. Online addition of new CSLSs will

not interrupt your process.

Fully redundant communications. The safety networks are

fully redundant communication networks. The carriers for all

nodes have redundant safety network ports for communication

with primary and secondary network connections.

Port mirroring functionality. Port Mirroring can be

configured on the NextGen Safety Network Switches

either with an “administrator” role or a “engineer” role.

These switches have the capability to mirror the traffic of

several source ports, in a read only manner, to a destination port (probe port).

Benefits

Dedicated to safety. Some systems from other

vendors use the same networks for both control and

safety. The DeltaV SIS LSN and GSN are dedicated to safety,

carrying only safety-rated signals and isolated from the

control network. They are therefore immune to any failure

of the control network.

Fifty millisecond update time. All the data broadcast on the

LSN is available to every CSLS on the same LSN every

50 milliseconds. Combined with the speed of the CSLS,

the 50 millisecond update time guarantees input-to-output

time of less than 300 milliseconds anywhere on the LSN

when the CSLS is configured for 50-millisecond scan rate.

Plug-and-play components. As a dedicated safety network

with predictable communications traffic, Emerson has done all

of the system testing so you only have to plug the components

together to create the safety networks.

Standards compliance. Network components are compliant

with standards such as IEEE, CE, and CSA.

• Dedicated to safety – no possibility

of common-cause control and safety

communication failures

• Required update time supported on

the DeltaV SIS™ local safety network

• Scalable and cost-effective

• Fully redundant networks

Introduction

The local safety network (LSN) is the communication backbone

of the DeltaV SIS™ process safety system. The LSN is a standard

Ethernet network dedicated to the DeltaV SIS system that

enables communication between CHARMs smart logic solvers

(CSLS) and a single SZ controller. The CSLSs communicate

secure parameters and input data to other CSLSs over the LSN.

SZ controllers connect to both the area control network and

the LSN to isolate the CSLSs from the process control system.

Starting with v13. the global safety network (GSN) enables

safety-rated communication among LSNs while allowing

functional segregation on different LSNs. A typical example is

separation of fire and gas (F&G) and emergency shutdown

(ESD) applications over separate LSNs while allowing safe and

secure communication across both applications. Starting with

v14.LTS, the GSN can be logically separated in domains which

are a group of LSNs.

The terminals are listed below:

TB3 RTD INPUT TERMINALS: The leads of the 3-wire RTD should be wired as shown.

If a 2-wire RTD is used, the RTD return and RTD sense terminals must be jumpered

to avoid an open RTD sense wire warning.TB2 Reference Electrode and Solution

Ground: The reference electrode lead and its shieldand the solution ground lead

should be grounded as shown. If the sensor does not have a solution ground,

there are two options:

1. The reference voltage input and solution ground can be jumpered.

If this is done, the reference impedance will read a constant value of 0 kilohms.

2. The second method is to turn on the solution ground terminal and set the Reference

Impedance parameter (Reference Z) in the program menu (see Section 7.3.7) to High, 

thus turning off the reference impedance measurement.

If the solution ground terminal is left open without doing so, a high reference

impedance fault alarm will continue to sound.

TB4 Preamplifier Power: The power wire from the pH sensor or preamplifier in the junction box

is connected to this terminal to supply power to the preamplifier.

TB1 pH Electrode Input: The pH electrode lead and its shield are located on this terminal as shown.

Smart pH Sensor: The smart pH sensor has a ground wire (not to be confused with the solution ground wire)

that should be connected to the enclosure ground as shown in the power wiring diagram

Sensor Wiring

Overview

Connect the correct sensor leads to the main board according to the lead locations

labeled directly on the main board.Rosemount Analytical SMART pH sensors can be connected

to the 1066 using either the integrated cable SMART sensor or a compatible VP8 pH cable.

After completing the wiring of the sensor leads, carefully route the excess sensor cable through the cable

gland.

Separate the sensor and output signal wiring from the loop power wiring.

Do not place the sensor and power wires in the same conduit or near a cable bridge.

Sensor Wiring Details

Sensor wiring should be done in the order shown above.

TB4 Preamplifier Power: The power wire from the pH sensor or preamplifier in the junction box

is connected to this terminal to supply power to the preamplifier.

TB1 pH Electrode Input: The pH electrode lead and its shield are located on this terminal as shown.

Smart pH Sensor: The smart pH sensor has a ground wire (not to be confused with the solution ground

wire) that should be connected to the enclosure ground as shown in the power wiring diagram

CHARM Keying Posts

The Terminal Blocks contain keying posts that are

automatically set and locked to the unique position of

the installed CHARM. The keys prevent the insertion of an

incorrect CHARM during maintenance activities. They are

shipped in a neutral position and are set when a CHARM is

inserted. If needed, the keys can be manually reset to allow

a channel to be re-tasked for a different signal type.

The keying mechanism consists of two keying posts that

rotate and lock into the terminal block base. Each CHARM

type is assigned a unique key setting.

Numatics 580 CHARM Node

The 580 CHARM node enables Easy solenoid valve

integration into DeltaV with Electronic Marshalling. The

new 580 CHARM node connects directly to the CIOC via

redundant CHARM Baseplate extender cables. DeltaV can

autosense the I/O as DO Solenoid Valve CHARMs the same

way as any other CHARM is autosensed in DeltaV.

Benefits of the new 580 CHARM Node include:

Redundant communications and power connections to

pneumatic valve manifolds.

Eliminates the need for additional dedicated networks

like Profibus-DP and simplifies system I/O mapping.

Expands the Electronic Marshalling I/O offering to include

ASCO Numatics pilot valve manifolds, enhancing the

concept of: “I/O Anywhere”.

Reduces programming and commissioning

time dramatically.

Numatics 580 CHARM Node

The 580 CHARM node enables Easy solenoid valve

integration into DeltaV with Electronic Marshalling. The

new 580 CHARM node connects directly to the CIOC via

redundant CHARM Baseplate extender cables. DeltaV can

autosense the I/O as DO Solenoid Valve CHARMs the same

way as any other CHARM is autosensed in DeltaV.

Benefits of the new 580 CHARM Node include:

Redundant communications and power connections to

pneumatic valve manifolds.

Eliminates the need for additional dedicated networks

like Profibus-DP and simplifies system I/O mapping.

Expands the Electronic Marshalling I/O offering to include

ASCO Numatics pilot valve manifolds, enhancing the

concept of: “I/O Anywhere”.

Reduces programming and commissioning

time dramatically.

The Relay Output Terminal Block is designed for high

output current applications and requires the DO 24V DC

High-side CHARM to drive the relay coil. The Relay Output

Term blocks provide a normally open and normally closed

contact with the following ratings:

• 28.8V DC at 5 A switching current

• 48V DC at 0.4 A switching current

• 110V DC at 0.2 A switching current

• 250V AC at 5 A switching current

The Thermocouple / mV Terminal Block is specially

designed for the usage with the Thermocouple / mV

CHARM. The Thermocouple / mV Terminal Block has fixed

key positions to prevent a mismatch in the field and can

only be ordered as an Assembly with the Thermocouple /

mV CHARM.

The 3-wire AI Fused Injected Power Terminal Block

is designed for 3 wire analog transmitters and can be

used with the AI 4-20mA HART CHARM. The field power is

supplied from the injected power bus on the baseplate,

but the power is not removed from the field device when

the AI CHARM is removed from the baseplate. There is

a Green LED on the terminal block that indicated power

is supplied to the field and the 2A fuse also functions

as a means to disconnect power from the field device.

Although this terminal block was introduced in 2017. it

is backwards compatible to any version of DeltaV with

Electronic Marshalling.

Although any signal type can be installed in any location on

the CHARM baseplates, it is recommended that AC voltage

circuits be separated from low voltage signals to comply

with safety recommendations and to mitigate induced noise

in the signals. Standard Terminal blocks, Fused Injected

Power terminal blocks and Relay Output Blocks can be used

on the same carrier, typically, to allow the use of DO 24V

DC isolated CHARMs on higher wattage and 3-wire devices

alongside of standard 24V DC instrumentation signals or

relay contacts.