Emerson DeltaV SIS Logic Solver (SLS1508)

Remote Peer Ring: SISnet repeaters hosted by different controllers communicate through fiber optic ring networks. Local repeaters aggregate global variable messages and transmit them along the ring network. Receiver repeaters broadcast and forward them on the local SISnet, while global messages are transmitted only once along the ring network. The primary and backup repeaters form independent fiber optic rings.

（3） Unique redundancy mechanism

Redundant operation mode: The redundant SLS1508 dual machine always runs in parallel, reading I/O inputs, executing safety logic, and driving outputs, without distinction between master and backup/master-slave; Only one (Active state, indicator light on) communicates with the workstation and SISnet, while the other (Standby state) only connects to SISnet.

Fault handling: When a single machine detects a fault, it automatically enters a failure state, and all output channels are powered off, but it does not affect the operation of another machine (continuing to read and write I/O, executing logic), and redundant switching is completely undisturbed; In safe areas, faulty modules can be replaced with electricity, while in hazardous areas, specific installation procedures must be followed.

Integrity alarm: Real time monitoring of redundant pair status, triggering alarm scenarios including: hardware failure of logic solver, communication failure between logic solver and SISnet, communication failure between redundant pairs, communication failure between logic solver and DeltaV controller, and removal of logic solver from carrier; Alarm information and device status can be viewed in the diagnostic browser.

Automatic verification testing: Redundancy can be configured for automatic verification testing. After setting the testing interval, the system will automatically execute and issue a warning to the operator before testing to ensure the effectiveness of safety functions.

（4） Sequence of Events (SOE) function

Basic function: Automatically generate events when executing function blocks during the module scanning cycle, with a timestamp resolution of<1ms, and record them in the event log in the order of occurrence; Standard functional blocks (input block, voting block, cause and effect block, etc.) can automatically generate events (such as I/O faults, trip limit triggering, first output signal) without special configuration, and record the simulated values and triggering conditions during tripping.

First out positioning: When the factory emergency stops, the "first out trip" signal in the event log can be filtered to quickly locate the first input that triggers the trip, simplifying fault diagnosis.

High resolution extension: If higher temporal resolution (0.25ms) is required, the channel can be simultaneously connected to SLS1508 and DeltaV discrete input SOE cards.

Hardware specifications and I/O channel parameters

（1） General Environment and Physical Specifications

1. SLS1508 Universal Environment Specification

Category parameter details

Working temperature -40~70 ° C (-40~158 ° F), long-term high-temperature operation shortens lifespan

Storage temperature -40~85 ° C (-40~185 ° F)

Relative humidity 5%~95% (no condensation)

Pollutant level ISA-S71.04-1985 G3 level (with conformal coating)

Protection level IP20

Hazardous Area Certification: European EMC Directive (EN61326-1, Criterion A), NAMUR NE21 EMC Requirements, Low Voltage Directive (IEC 61010-1), FM Class I Div 2 (Groups A-D, T4, No Arc) ATEX 3 G EEx IIC-nA T4（EN50021:1999）、CSA 1010

Anti impact 10g half sine wave (continuous for 11ms)

Vibration 5-16Hz (1mm peak to peak), 16-150Hz (0.5g)

2. SLS1508 Physical and Electrical Specifications

Project parameter details

Input power supply 24V DC ± 20%, 1.0A (basic power consumption)+on-site power supply (total power consumption 5.0A); Suggest using an independent power supply with DeltaV controller/I/O

The maximum on-site power supply is 4A (actual value depends on channel type and on-site equipment)

Isolation level: Each channel is optically isolated from the system (1500VDC factory test), and there is no isolation between channels

No local bus current

Installation method: SIS (yellow) terminal block on a wide carrier with odd numbered slots; Redundant occupation of 4 slots

Redundancy for weight 1.20kg

Redundancy for heat consumption of 24W

Redundancy for 24V power consumption DC@2A +Digital output on-site load

Dimensions (Front/Side) 83.8mm (3.3 inches)/110.0mm (4.3 inches)

（2） Detailed parameters of I/O channels

1. Analog input channel (including HART)

Project parameters

Number of channels 16

Isolate each channel from the system's optical isolation (1500VDC test), with no isolation between channels

Nominal signal range 4~20mA

Full signal range 1-24mA

When the 2-wire transmitter is powered by 20mA, the minimum voltage between terminals is 15.0V, and the maximum current limit is 24mA

2.0% of the safety/diagnostic accuracy range

Resolution 16 bits

Filter 2nd order, cut-off frequency 5.68Hz (-3dB), at 40Hz (1/2 of sampling rate) -20.0dB

2. HART dual state output channel

Project parameters

Number of channels 16

Isolate each channel from the system's optical isolation (1500VDC test), with no isolation between channels