Capacity limits for SLS 1508 SIS systems

Table: SLS 1508 system capacities
SLS 1508 SIS property	Limits
SLS 1508 Logic Solvers on a single DeltaV controller (can be mixed between simplex and redundant)	32
Secure parameters per SLS 1508 Logic Solver	8 (16 if high-density)
Secure parameter per SIS module (depends on if the logic solver the module is assigned to is configured for high-density secure parameters)	8 (16 if high-density)
Logic solvers that can be System Global Publishers	16
System Global Secure Parameters in an SLS 1508 system: 16 Logic Solvers × 8 System parameters (16 × 16 for high density).	128 (256 if high-density)
Logic Solver I/O channels on a single DeltaV controller: 16 I/O channels × 32 Logic Solvers.	512
SISNet Repeaters connected in a ring (The primary and secondary SISNet Repeater rings are separate and independent rings. )	100
SLS 1508 Logic Solvers in a single DeltaV system: 100 controllers × 32 Logic Solvers per controller.	3200
Function blocks per SIS module	250⁽¹⁾
User-defined parameters per SIS module	247
SIS Modules in a Logic Solver	4
Non-secure parameter references in a logic solver	24
Domains in an SIS Network	15
Simulated logic solvers running in the ProfessionalPLUS workstation	32
Simulated logic solvers running in an Application Station	32

Table: SLS 1508 global publisher andsecure parameter capacities
SIS capacity	Per controller	Per domain	Per system
Domain and system global publishers
Maximum number of logic solvers that can be domain global publishers	16	32	480 (15 domains × 32 domain publishers.)
TOTAL number of logic solvers that can publish data globally	32 (16 Domain publishers + 16 system publishers.)	48 (32 Domain publishers + 16 system publishers.)	496 (480 Domain publishers + 16 system publishers.)
Domain and system secure parameters
Maximum number of domain secure parameters	128 (256 if high-density) ( 16 Logic Solvers × 8 domain parameters (16 × 16 for high density.))	256 (512 if high-density) (32 domain publishers × 8 domain parameters (32 × 16 for high density.))	3840 (7680 if high-density) (480 domain publishers × 8 domain parameters (480 × 16 for high density.))
TOTAL number of secure parameters published globally	256 (512 if high-density) (128 domain parameters + 128 system parameters (256 + 256 for high density.))	384 (768 if high-density) (256 domain parameters + 128 system parameters (512 + 256 for high density.))	3968 (7936 if high-density) (3840 domain parameters + 128 system parameters (7680 + 256 for high density.))

Table: Capacities common to both SIS systems
Common SIS capacities	Limits
Temporary variables defined using VAR…END_VAR per expression	32
Function blocks in the top level of an SIS module	127⁽¹⁾
Function blocks per composite	127⁽¹⁾

⁽¹⁾ The actual value may be less depending on a number of factors including: the complexity of SIS module configuration and the number and type of SIS function blocks used.