S800 I/O Station
A S800 I/O Station can consist of a base cluster and up to 7 additional I/O clusters. The base cluster consists of a Fieldbus Communication Interface and up to 12 I/O modules. I/O cluster 1 to 7 consist of an Optical ModuleBus modem and up to 12 I/O modules. A S800 I/O Station can have a maximum of 24 I/O modules. I/O cluster 1 to 7 is connected to the FCI module through an optical expansion of the ModuleBus.

ModuleBus
The Fieldbus Communication Interface module communicates with its I/O modules over the ModuleBus. The ModuleBus can support up to 8 clusters, one base cluster and up to 7 I/O clusters. The base cluster consists of a communication interface module and I/O modules. An I/O cluster consists of an Optical ModuleBus modem and I/O modules. The Optical ModuleBus modems are connected via optical cables to an optional ModuleBus Optical port module on the communication interface module. The maximum length of the Optical ModuleBus expansion is dependent of the number of Optical ModuleBus modems. The maximum length between two clusters is 15 m (50 ft.) with plastic fiber and 200 m (667 ft.) with glass fiber. Factory made optical cables plastic fiber) are available in lengths of 1.5, 5 and 15 m (5, 16 or 49 ft.). The Optical ModuleBus expansion can be build up in two ways, a ring or a duplex communication.

Fieldbus Communication Interface modules
The Fieldbus Communication Interface (FCI) modules have an input for one 24 V D.C. power. The FCI provides 24V D.C. (from the source) and isolated 5V D.C. power to the base cluster’s I/O modules (12 maximum) by way of the ModuleBus connections. There are three types of FCI one for single Advant Fieldbus 100 configurations, one for redundant Advant Fieldbus 100 configurations and one for single PROFIBUS configurations. The power source can be the SD811/812 power supplies, battery, or other IEC664 Installation Category II power sources. Power status inputs, 2 x 24 V, to monitor 1:1 redundant mains are also provided.

Module Termination Units
Termination Units are available as Compact MTU or Extended MTU. A compact MTU normally offers termination of one wire per channel for a 16-channel module. With compact MTU power distribution of field circuits must be made with external terminal blocks and current limiting components if required. Extended MTU with group-wise isolated interfaces allows for two or three wire termination of field circuits and provides group-wise or individually fuses, maximum 6.3A glass tube type, for powering field objects. Extended MTU, which offer two or three wire terminations, allows direct field object cable termination. The need for external marshalling is therefore drastically reduced or eliminated when extended MTU is used.

Optical ModuleBus Expansion
Using a ModuleBus Optical port module on the Fieldbus can expand the ModuleBus Communication Interface module and communicates via an optical cable with the Optical ModuleBus modem in the I/O cluster. 

S800 I/O modules supported by the Advant Controller 400 Series

S800L I/O Assortment
AI801	Analog, 1*8 Inputs. 0…20mA, 4...20mA, 12 bit., 0.1%
AO801	Analog, 1*8 Outputs, 0…20mA, 4...20mA, 12 bit.
DI801	Digital, 1*16 Inputs, 24V D.C.
DO801	Digital, 1*16 Outputs, 24V D.C., 0.5A short circuit proof

S800 I/O Assortment
AI810	Analog, 1*8 Inputs 0(4) ... 20mA, 0 ... 10V
AI820	Analog, 1*4 Inputs, bipolar differential
AI830	Analog, 1*8 Inputs, Pt-100 (RTD)
AI835	Analog, 1*8 Inputs, TC
AI890	Analog, 1*8 Inputs. 0…20mA, 4...20mA, 12 bit, IS. interface
AO810	Analog, 1*8 Outputs 0(4) ... 20mA
AO820	Analog, 4*1 Outputs, bipolar individually isolated
AO890	Analog 1*8 Outputs. 0…20mA, 4...20mA, 12 bit, IS. interface
DI810	Digital, 2*8 Inputs, 24V D.C.
DI811	Digital, 2*8 Inputs, 48V D.C.
DI814	Digital, 2*8 Inputs, 24V D.C., current source
DI820	Digital, 8*1 Inputs, 120V A.C./110V D.C.
DI821	Digital, 8*1 Inputs, 230V A.C./220V D.C.
DI830	Digital, 2*8 Inputs, 24V D.C., SOE Handling
DI831	Digital, 2*8 Inputs, 48V D.C., SOE Handling
DI885	Digital, 1*8 Inputs, 24V/48V D.C., open circuit monitoring, SOE Handling
DI890	Digital, 1*8 Inputs, IS. interface
DO810	Digital, 2*8 Outputs 24V, 0.5A short circuit proof
DO814	Digital, 2*8 Outputs 24V, 0.5A short circuit proof, current sink
DO815	Digital, 2*4 Outputs 24V, 2A short circuit proof, current sink
DO820	Digital, 8*1 Relay Outputs, 24-230 V A.C.
DO821	Digital, 8*1 Relay Outputs, normally closed channels, 24-230 V A.C.
DO890	Digital, 1*4 Outputs, 12V, 40mA, IS. interface
DP820	Pulse Counter, 2 channels, Pulse Count and Frequency Measurement 1.5 MHz.