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ABB Power supplies for AC 900F, AC 700F and S700 I/O
Source: | Author:kongjiang | Published time: 2026-05-18 | 5 Views | 🔊 Click to read aloud ❚❚ | Share:
The following power supplies are compatible with AC 900F, AC 700F and S700 I/O systems, providing 24 V DC to CPU modules, I/O modules, and field devices. Accessories such as voter, redundancy, and messaging modules enable the setup of a redundant power supply and its monitoring. Alternatively, power supplies meeting the technical requirements in the M&I manual can be used. The document then provides an overview of Remote I/O systems S700, S800, and S900. Remote I/O systems can be assembled in the control room or directly in the field, with S900 I/O suitable for hazardous areas. On-site assembly is easy, reducing cabling costs. All devices used in hazardous areas must be certified for Zone 1 or Zone 2. S700 I/O can be used as direct I/O for AC 700F and AC 900F or as PROFIBUS remote I/O for various masters. Benefits include a small footprint and high packing density. The document lists various S700 I/O modules, including the CI 741F communication interface, digital I/O modules (DC 723F, DC 732F, DI 724F, DX 722F, DX 731F), analog I/O modules (AI 723F, AI 731F, AO 723F, AX 722F), and the digital/analog module DA 701F. Terminal units (TU 709F, TU 710F, TU 715F, TU 716F, TU 731F, TU 732F) are designed for connecting I/O modules and field cables, ensuring easy removal and replacement of modules without disturbing wiring.

The following power supplies are compatible   with AC 900F, AC 700F and S700 I/O. They can   be used to provide 24 V DC to CPU moduls, I/O   modules and field devices. Accessories, such as voter-, redundancy- and messaging modules,   enable the setup of a redundant power supply and its monitoring.

Alternatively, Power Supplies that supports the technical requirement described in the M&I   manual can be used.

Further information on power supplies can be found in the related product documentation.

SD831 3 A 3BSC610064R1 

SD832 5 A 3BSC610065R1 

SD833 10 A 3BSC610066R1 

SD834 20 A 3BSC610067R1

I/Os

The following chapter will give you a brief over view about the Remote I/O systems S700, S800 and S900.

The picture above shows a sketch of a possible PROFIBUS topology without going into detail. The controllers are assembled in the control room.   Remote I/O systems can be assembled in the   control room or directly in the field. Furthermore, S900 I/O can be placed locally in the field in haz ardous area, depending on the customer’s needs. Field devices are connected to the remote I/O systems. With AC 700F and AC 900F a subset of S700 I/O can be plugged as direct I/O to the right side of the controller.  

Remote I/O systems can also be mounted locally in the field, near field devices. This type of instal lation reduces the costs for cabling from the field device to the system.

On-site assembly of the remote I/O systems is easy, as only a single cable is required for   PROFIBUS communication and just a suitable field housing is needed for mounting. This   field housing usually has the IP66 degree of protection. Other devices such as fiber optic   couplers, pneumatic valves, terminals, terminal blocks or additional electronical devices can also be mounted in such a field housing. This reduces both design, engineering and cabling costs.

In order for devices to be installed in hazardous areas, extra regulations and functional rules   need to be considered in addition to the usual   engineering rules.

All devices which are used in hazardous area have to be certified. The devices shall have a certificate for either Zone 1 or Zone 2. The S900 remote I/O system (S and B series) is suitable for installation in hazardous areas, see the table below:

S700 I/O


S700 I/O can be used as direct I/O for AC 700F and AC 900 or as PROFIBUS remote I/O for AC 700F, AC 800F, AC 900F or other PROFIBUS Masters. Up to ten I/O modules can be connected to the fieldbus interface module CI 741F.

One of the S700 I/O benefits is the small foot print – the modules are featured with a high   packing density, several modules are available with inputs and outputs mixed in one module. Currently, 10 different module types are available covering a wide variety of applications 


S700 I/O modules

The following table lists the entire set of S700 I/O modules. All modules can be used as remote I/O at PROFIBUS DP. The indicated subset can be used as direct I/O together with the AC 700F and AC 900F controller.

DC 732F

AI 723F

AX 722F

AO 723F

DX 722F

DX 731F

AI 731F

DI 724F

DA 701F

CI 741F

DC 723F

S700 I/O modules

CI 741F

The CI 741F is used as communication interface for PROFIBUS communication. The bus is con nected by the Sub-D connector on the TU 709F/ 710F terminal block. The module is characterized by the following features: • PROFIBUS DP interface • 2 analog inputs in one group (2.0 … 2.4) 

 • 2 analog outputs in one group (2.5 … 2.7) 

 • 8 digital 24 V DC inputs in one group (3.0 ... 3.7) 

 • 8 digital outputs in one group (4.0 ... 4.7) You can use the standard PROFIBUS plug to   connect the PROFIBUS DB fieldbus to the CI 741F and/or the corresponding TU 709F/710F terminal block.

Digital I/O Modules

DC 723F  Digital input/output module 24 DI/DO: 24 VDC/0.5 A 1-wire, 24 VDC 300 W TU 715F /TU 716F (terminal unit not included)
DC 732F Digital Input / Output Module 16 DI, 16 DI/DO, 24 VDC / 0.5 A, 1-Wire, 24 VDC 200 W. Without terminal unit. 

 • PROFIBUS remote I/O

 • Direct I/O for AC 700F and AC 900F

The DC 732F module offers 32 channels. 16   channels are assigned as digital inputs, while   the remaining 16 channels can be configured   as input or as output.

I/OS: S700, S800, S900 FREELANCE DCS PRODUCT CATALOG

The configurable channels are defined by the   wiring. As you can see from "Wiring of DC 732F", some of the first 16 input channels show the cor responding wiring. For the next 16 configurable channels you see some examples for inputs   (channel 16, 23, 24, and 31) and some examples   for outputs (channel 19 and 27). Note that the power has to be supplied depending on the planned power consumption as indicated. The   I/O bus supplies the power for the modules   electronics only.

Digital input module DI 724F

DI 724F Digital input module 32 DI: 24 VDC 1-wire, 24 VDC 1 W TU 715F /TU 716F   (terminal unit not included) 

 • PROFIBUS remote I/O 

 • Direct I/O for AC 700F and AC 900F

It has 32 channels with the following features: • 32 digital inputs 24V DC in four groups (1.0…4.7) The technical data correspond to the input values. The inputs are electrically isolated from the other electronic circuitry of the module. There is no   potential separation between the channels.

Digital input / output module DX 722F

DX 722F Digital input / output module 8 DI: 24 VDC 8 DO: relay contacts, 24 VDC, 230 VAC 1/3-wire, 24 VDC 2 W TU 731F /TU 732F (terminal unit not included) 

 • PROFIBUS remote I/O 

 • Direct I/O for AC 700F and AC 900F

It has 16 channels with the following features: • 8 digital inputs 24 V DC in one group (1.0...1.7) • as well as 8 relay outputs (2.0…2.7), with one switch-over contact each The technical data correspond to the input   and output values. The inputs and outputs are   electrically isolated from the other electronic   circuitry of the module. There is no potential   separation between the input channels.

Digital input/output module DX 731F

DX 731F Digital input / output module 8 DI: 120/230 VAC 4 DO: relay contacts, 24 VDC,   120/230 VAC 2-wire, 24 VDC 2 W TU 731F /TU 732F (terminal unit not included) 

 • PROFIBUS remote I/O 

 • Direct I/O for AC 700F and AC 900F

It has 12 channels with the following features: 

 • 8 digital inputs in two groups (2.0...3.3) 

 • as well as 4 relay outputs (2.4...2.7), with one switch-over contact each The technical data correspond to the input   and output values. The inputs and outputs are   electrically isolated from the other electronic   circuitry of the module.

Analog I/O Modules 

AI 723F Analog input module 16 AI: +-10 V, 0/4-20 mA 24 VDC, Pt100 12 bit + Sign, 2-wire, 24 VDC 5 W. Without terminal unit. 

 • PROFIBUS remote I/O 

 • Direct I/O for AC 700F and AC 900F

The AI 723F module comes with 16 input channels. Each of these channels can be individually config ured depending on its intended usage. Possible applications are: 

 • Sensing a voltage (0…10 V or -10…+10 V) 

 • Sensing a current (0…20 mA or 4…20 mA) 

 • Temperature measurement (platinum or nickel resistance thermometers Pt100, Pt1000, Ni1000) 

 • For 3-wired connections two channels are   required

Analog input module AI 731F (Thermocouple)

AI 731F Analog input module 8 AI: TC, RTD, mV/V, mA, kOhm and 24 VDC 15 Bit + sign, 2-, 3- and 4-wire, 24 VDC 5 W TU 715F /TU 716F (terminal unit not included) 

 • PROFIBUS Remote I/O 

 • Direct I/O for AC 700F and AC 900F

Analog output module AO 723F

AO 723F Analog output module 16 AO: +-10 V, 0/4-20 mA max. 8 AO usable as current outputs 12 Bit + sign, 2-wire, 24 VDC 8 W TU 715F /TU 716F (terminal unit not included 

 • PROFIBUS Remote I/O 

 • Direct I/O for AC 700F and AC 900F

Analog input / output module AX 722F

AX 722F Analog input / output module 8 AI: +-10 V 0/4-20 mA 24 VDC, Pt100. 8 AO: +-10 V 0/4-20 mA 24 VDC. 12 bit + Sign, 2-wire, 24 VDC 5 W. Software version 2013 SP1 RU04 or higher is mandatory. Use with TU 715F / TU 716F. 

 • PROFIBUS Remote I/O 

 • Direct I/O for AC 700F and AC 900F

The AX 722F module offers even more flexibility, as it combines analog input and output channels in one module with 16 channels. Eight of these channels can be individually configured as in puts, which can again sense voltage, current, or   temperatures.  

Furthermore four channels can be configured as analog voltage outputs (-10 V to +10 V) or analog current outputs (0 … 20 mA or 4 … 20 mA) and the remaining four channels can provide voltage signals in the range from -10 V to +10 V.

Digital/analog I/O module

Digital/analog module DA 701F

DA 701F Digital / analog module 16 DI: 24 VDC 8 DI/DO: 24 VDC/0.5 A 4 AI: +-10 V 0/4-20 mA, RTD , 24 VDC 2 AO: +-10 V, 0/4-20 mA 12 Bit + sign, 1-wire, 24 VDC 200 W TU 715F /TU 716F (terminal unit not included) Software version 2013 SP1 RU04 or higher is mandatory. 

 • PROFIBUS Remote I/O 

 • Direct I/O for AC 700F and AC 900F

It has 30 channels with the following features: 

 • 16 digital inputs, 24 V DC 

 • 8 configurable digital inputs/outputs 24 V DC, 0.5 A max. 

 • 4 analog inputs, voltage, current and RTD,   resolution 12 bits plus sign 

 • 2 analog outputs, voltage and current,   resolution 12 bits plus sign The technical data correspond to the input   and output values. The inputs and outputs are electrically isolated from the other electronic   circuitry of the module. There is no potential   separation between the channels.

S700 I/O terminal units

TU 709F 

3BDH000397R0001

TU 710F

TU 715F

TU 716F

TU 731F

TU 732F

The upper area of a terminal block is designed for the connection of an I/O module or a PROFIBUS communication interface. In the lower area, the field cables are connected to up to 32 I/O termi nals. The terminal blocks ensure the electrical connection of sensors and actuators. I/O mod ules can thus be removed or replaced without   detaching the field wiring. The I/O Bus in the upper terminal block area transmits I/O data and diagnostic data between   a CPU module or a PROFIBUS communication interface and the I/O modules. This I/O Bus can be extended using the terminal blocks   TU 715F/716F and TU 731F/732F in order to increase the number of I/O modules. The maximum number of I/O terminal blocks   depends on the application and/or configuration: 

 • AC 700F with direct I/O: max. 8 I/O modules 

 • AC 900Fwith direct I/O: max. 10 I/O modules 

 • PROFIBUS remote I/O: number of I/O modules determined by the PROFIBUS communication interface and the type of I/O modules used Terminal blocks for PROFIBUS communication   interfaces are additionally provided with a   PROFIBUS connection or a fieldbus plug connec tion to connect the PROFIBUS either directly or via the PDP22 fieldbus plug (FieldBusPlug). The I/O module or the communication interface   is plugged to the terminal block and locked in place by two mechanical locks. The terminal block is then mounted to a DIN rail together with the module. Wall mounting of the terminal block   using the TA526 accessory for wall mounting and two screws is alternatively possible. The terminal blocks are available either with screw terminals or spring-cage terminals. The   information provided in the following table   applies to both versions.

TU 709F/TU 710F

3BDH000397R0001 3BDH000398R0001

The TU 709F/710F terminal block serves as a base for the PROFIBUS communication interface CI 741F. The terminal block is rated for 24 V I/O   signals. The following terminals are connected with each other inside the terminal block: • Terminals 2.8 and 3.8: supply voltage UP = +24 V DC • Terminals 2.9 to 4.9: reference potential ZP = 0 V for UP and UP3 The digital outputs DO0 to DO7 are equipped with an own power supply connection UP3 (4.8) and can thus be separately protected and supplied. The power supply of the PROFIBUS interface, the I/O Bus and the other inputs/outputs is ensured by the UP.

5.2.6.4. TU 715F/TU 716F  

TU 715F I/O terminal unit, 24 VDC Screw type terminals, 1/2 wire. 3BDH000378R0001 TU 716F I/O terminal unit, 24 VDC Spring type terminals, 1/2 wire. 3BDH000382R0001

The I/O Terminal Units TU 715F (screw type   terminal) and TU 716F (spring type terminal)   are used as a socket for the I/O module, which   exclusively incorporates inputs and outputs for 24V DC digital or analog signals. The I/O modules (I/O expansion modules) are placed on the I/O Terminal Unit and locked into place using two   mechanical locks. To loosen this connection a screw driver should be inserted in the recess   provided and the Terminal Units are carefully pulled away. All electrical connections are made through the Terminal Unit, which allows removal and replacement of the I/O units without disturb ing the wiring at the terminal unit. The terminals 1.8 to 4.8 and 1.9 to 4.9 are electri cally interconnected within the I/O Terminal Unit and always have the same assignment irrespec tive of which I/O expansion module is inserted: 

 • Terminals 1.8 to 4.8: Process voltage UP = +24 V DC 

 • Terminals 1.9 to 4.9: Process voltage ZP = 0 V The assignment of other terminals is dependent on the I/O expansion module that is inserted. The supply voltage of +24 V DC device-voltage for the electronic circuitry of the device comes from the I/O expansion bus (I/O Bus) and from the CPU respectively.

TU 731F/TU 732F

The I/O Terminal Units TU 731F (with screw   type terminals) and TU 732F (with spring type   terminals) are specifically designed for use with AC 700F/AC 900F/S700 I/O modules that incorpo rate 115-230 V AC inputs and/or 115-230 V AC relay outputs. The input/output modules (I/O expansion   modules) plug into the I/O terminal Unit. When properly seated, they are secured with two   mechanical locks. All the electrical connections are made through the Terminal Unit, which allows removal and replacement of the I/O modules with out disturbing the wiring at the Terminal Unit. The terminals 1.8 to 4.8 and 1.9 to 4.9 are electri cally interconnected within the I/O Terminal Unit and have always the same assignment, irrespec tive of which I/O expansion module is inserted: 

 • Terminals 1.8 to 4.8: Process voltage UP = +24 V DC 

 • Terminals 1.9 to 4.9: Process voltage ZP = 0 V The assignment of the other terminals is depen dent on the inserted expansion module (see the description of the used expansion module). The supply voltage 24 V DC for the module‘s electronic circuitry comes from the I/O expansion bus (I/O Bus) or from the FieldBusPlug or from the AC 700F or AC 900F CPU.