GE IS200ICBDH1B MARK 6 CONTROL BOARD

Description

GE General Electric Technical Specifications: IS200ICBDH1B

IS200ICBDH1B Two independent two-wire RS485 ports are provided. Up to 32 489 relays can be daisy-chained together on a communica

tion channel without exceeding the driver capability. For larger systems, additional serial channels must be added. It is also

possible to use commercially available repeaters to increase the number of relays on a single channel to more than 32. A

suitable cable should have a characteristic impedance of 120 Ω (e.g. Belden #9841) and total wire length should not

exceed 4000 feet (approximately 1200 metres). Commercially available repeaters will allow for transmission distances

greater than 4000 ft.

Voltage differences between remote ends of the communication link are not uncommon. For this reason, surge protection

devices are internally installed across all RS485 terminals. Internally, an isolated power supply with an optocoupled data

interface is used to prevent noise coupling.

To ensure that all devices in a daisy-chain are at the same potential, it is imperative that the common termi

nals of each RS485 port are tied together and grounded only once, at the master. Failure to do so may

result in intermittent or failed communications.

The source computer/PLC/SCADA system should have similar transient protection devices installed, either internally or

externally, to ensure maximum reliability. Ground the shield at one point only, as shown below, to avoid ground loops.

Correct polarity is also essential. All IS200ICBDH1B must be wired with all ‘+’ terminals connected together, and all ‘–’ terminals con

nected together. Each relay must be daisy-chained to the next one. Avoid star or stub connected configurations. The last

device at each end of the daisy chain should be terminated with a 120 Ω ¼ W resistor in series with a 1 nF capacitor across

the ‘+’ and ‘–’ terminals. Observing these guidelines will result in a reliable communication system that is immune to system

transients.

It may be required to test for dielectric strength (“flash” or hi-pot”) with the 489 installed. The 489 is rated for 2000 V DC iso

lation between relay contacts, CT inputs, VT inputs, trip coil supervision, and the safety ground terminal G12. Some pre

cautions are required to prevent IS200ICBDH1B damage during these tests.

Filter networks and transient protection clamps are used between control power, trip coil supervision, and the filter ground

terminal G11. This filtering is intended to filter out high voltage transients, radio frequency interference (RFI), and electro

magnetic interference (EMI). The filter capacitors and transient suppressors could be damaged by application continuous

high voltage. Disconnect filter ground terminal G11 during testing of control power and trip coil supervision. CT inputs, VT

inputs, and output relays do not require any special precautions. Low voltage inputs (<30 V), RTDs, analog inputs, analog

outputs, digital inputs, and RS485 communication ports are not to be tested for dielectric strength under any circumstance

(see below)

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The maximum number of 8-Channel Analog Current/Voltage Output modules that can be installed

in a system are:

4 in a system using CPU Models 311, 313, or 323

8 in a system using CPU Model 331

32 in a system using CPU Models 340 and 341

64 in a system using CPU Models 350 – 364

Other Configuration Considerations

When planning the module configuration for your application you must also consider the load

capacity of the installed power supply and the total load requirements of all modules that are

installed in the baseplate.

Refer to Chapter 1 in this manual for details on power supply, baseplate, and module load

requirements. The following table lists the specifications for this module. Note that test conditions,

unless otherwise noted, are: VUSER = 24 VDC at an ambient temperature of 25 C (77 F)

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