CTI 2581 - 16-point Isolated 12-56 VDC Input Module

Special Function Programs

The controller compiles all SF programs and subroutines. 

They are compiled in the following situations:

• When a user program is downloaded to the PLC, if the SF Program or subroutine is enabled,

• When the SF program or subroutine is enabled, if the SF program has been modified,

• During a Power Up start (following the application of power).

Programs that contain errors will not be enabled. During a program download,

Workshop will display a message indicating the error. Once you acknowledge the message,

the download will continue, leaving the program disabled. You must correct the programming

error before the program or subroutine can be enabled. User Programs originally written

for the Simatic® 505 PLC may contain undetected errors, if the programs were not originally

compiled. This can occur because the SF interpreter never attempts to execute the instruction

due to the branching logic. A common problem is that additional ENDIF statements are included

or the correct number of ENDIF statements is not present.

Unlike the Simatic® 555. there are no restrictions regarding the instructions that can be used

in a compiled program.

User Configuration

The following differences in the user configuration should be noted:

1. Allocation of CS memory is not supported. The CTI 2500 Series® controller uses high

speed DRAM to store and execute compiled SF programs and subroutines.

Consequently, CS memory is not required.

2. User allocation of User Subroutine memory is not supported. 

The CTI 2500 controller does not support user subroutines (XSUB).

See XSUB description above.

3. A time slice for Report by Exception (RBE) is not supported.

Some alternative solutions exist. Please consult us with your exact configuration.

4. A new time slice, Network Communications, has been added to support the local Ethernet port.

CTI 901B-2500-RBC Profibus Remote Base Controller

CTI 901B-2500-RBC Profibus Remote Base Controller

CTI Control Techniques 901D-2500-RBC Profibus Remote Base Controller

CTI 2500-RIO-B RS485 Remote Base Controller

CTI 2500C-RBC-RS485 RS485 Remote Base Controller

CTI Control Technology 901E-2589-A Input Module PCB 

WOODHEAD SST DHP-PCI V1.2.0 SD-PCI-U DATA HIGHWAY PLUS INTERFACE CARD

Molex SST-PB3-VME-2 Brad Communication Board SSTPB3VME2E

AMAT 0190-34511 REV. 08 SST woodhead DNet bus scanner DNPCPCI3U1-NC- 3V V1.3.4

WOODHEAD SST-DN3-PCU-1 DEVICENET INTERFACE CARD

SST / WOODHEAD 5136-PFB-VME PROFIBUS INTERFACE CARD 5136PFBVME NIB

WOODHEAD SST-DN3-PCU-2( E) PCI DEVICENET INTERFACE CARD DN3-PCU-2(E) V1.2.8

SST Woodhead SST-ESR2-CLX-RLL Ethernet Modbus/Serial Modbus Communication

Woodhead PB3-PCIe 2 SST-PB3-PCIE 1 V1.1.0 Communication card

MOLEX SST-DN4-PCIE-H / SSTDN4PCIEH 

SST 5136-PFB-PCI Profibus Communications Adapter Module