GE IS200EXTBG2A input/output exciter terminal board

Description

GE General Electric Technical Specifications: IS200EXTBG2A

The IS200EXTBG2A 2-Channel Analog Current Output module for the Series 90-30 Programmable Logic

Controller provides two output channels, each capable of converting 12 bits of binary (digital)

data to an analog output for use as required by your application. The Analog Current Output

module is capable of providing outputs in the range of 0 to 20 mA. Resolution of the

converted signal is 12 bits binary (1 part in 4096). The sign bit is not used in the conversion

process. Both channels are updated on every IS200EXTBG2A scan (about 5 milliseconds). User data in the

%AQ registers is in a 16-bit 2’s complement format. The 13 most significant bits from the

%AQ register are converted to sign magnitude by the PLC and sent to the module. Twelve of

the bits are used by the D/A converter; the 13th bit (sign) is used to determine if negative data

was sent to the module.

The placement of the 13 bits within the data word is shown below. The relationship between

the current output and the data from the D/A converter is shown in Figures 3-34 and 3-35.

If the module is sent negative data, it outputs the low end of the current range (that is, 4 mA for

the 4 to 20 mA range). If a value which is out of range is entered (that is. greater than 32767),

the software does not accept the value.

This module provides two output ranges. The default range is 4 to 20 mA with user data scaled

so that a count of 0 corresponds to 4 mA and a count of 32000 corresponds to 20 mA with each

1000 counts representing 0.5 mA. When a RANGE jumper (either RANGE1 or RANGE2) is

added to the I/O terminal board, the output range is 0 to 20 mA with user data scaled so that a

count of 0 corresponds to 0 mA and a count of 32000 corresponds to 20 mA with each 800

counts representing 0.5 mA. The range of each output can be programmed individually. The

module provides a full 12 bits of resolution in either range. Scaling of the output is as shown in

Figures 3-36 and 3-37.

The IS200EXTBG2A state of the module if the CPU goes to the STOP mode or RESET, can be either Default to 0/4

mA or Hold-Last-State. Selection of the desired state is made by configuring the DEF0/4 jumper

on the detachable terminal board connector on the module. If the jumper is not installed, the

outputs will Hold-Last-State on STOP or RESET provided that a backup user supply is connected

when the system power goes down. If the DEF0/4 jumper is present, the module defaults to 4 mA

on the 4 to 20 mA range or 0 mA on the 0 to 20 mA range on STOP or RESET. One jumper per

module is used to program both outputs for Hold-Last-State or DEF0/4.

Each module IS200EXTBG2A output may be used as a current source or as a less accurate voltage source. A

voltage is output at VOUTx that corresponds to the current output. The selection of current or

voltage output is made with a jumper on the I/O terminal board. If no jumper is installed, the

module performs as a current source. If the JMPVx jumper is present, the module performs as a

voltage source. Each channel has the option of selecting voltage or current. The setting of the

current output range determines the voltage range. The voltage range can be increased by using a

250 ohm resistor in place of the voltage jumper from JMPVx to IOUTx. The following table shows

the relationship between range settings and voltage outputs.

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