GE IC690ACC900 RS-232 TO RS-485/422 Convertor Unit

The Mini Converter Kit consists of an RS-422 (SNP) to RS-232 Mini Converter integrated into a 6 foot (2 meter) serial extension cable,

and a 9-pin to 25-pin Converter Plug assembly. 

The 15-pin SNP port connector on the Mini Converter plugs directly into the serial port connector on the programmable controller. 

The 9-pin RS-232 port connector on the Mini Converter cable connects to an RS-232

compatible device.

Two LEDs on the Mini Converter indicate activity on the transmit and receive lines.

The Converter Plug is required to convert the 9-pin serial port connector on the Mini Converter to

the 25-pin serial port connector on an IC647 computer, an IBM® PC-XT, or a PS/2® Personal Computer.

The IC640 industrial computer requires an additional adapter (not supplied – please contact your local PLC distributor) for use with the Mini Converter.

Tables 1 and 2 list the Mini Converter pinouts. The direction of signal flow is with respect to the Mini Converter.

Program development process 

A resource contains several programming units called Program Organization Units (POUs). 

POUs can be programs, functions or function blocks. Programs can be described in any of the five IEC 61131-3 languages plus Flow Chart.

The Build 

To validate the project, the project code must be built. This step is also very useful for syntax checking; 

all detected errors can be easily located with a simple mouse-click. The generated code is fully publicly documented and supported. 

The code generator produces the code for each resource.

GENERAL SPECIFICATIONS

Common mode rejection (using 50/60Hz filter)

• > 120 dB @ 50/60 Hz

Series mode rejection (using 50/60Hz filter)

• > 65 dB @ 50/60 Hz

Maximum input voltage (except current I/P)

• ± 25V

Common mode voltage between channels

• 250 V ac rms

Isolation

• Channel to channel – 250 V ac rms

• Any channel to Railbus – 250 V ac rms

• Any channel to Bussd Field Power – 250 V ac rms

• Railbus to Bussed Field Power – 150 V ac rms

Input filter response

• Time constant 4 ms

Input impedance

• > 1 M ohm

Data Format

• 0 to 65535 corresponds to selected span

Linking variables to I/O channels 

Before defining the project code, the I/O is defined in the Workbench in the form of a tag database, 

which identifies the I/O channels and their respective field devices. Once a device is selected, a simple mouse-click 'connects' a variable to a channel.