GE IS200VCMIH2 IS200VCMIH2B VME communication interface board

Description

GE General Electric Technical Specifications: IS200VCMIH2

To program new setpoints using the front panel keys a hardware jumper must be installed across the setpoint

IS200VCMIH2 access terminals on the back of the relay. These terminals can be permanently wired to a panel mounted key

switch if desired. Attempts to enter a new setpoint without the electrical connection across the setpoint access

terminals will result in an error message. The jumper does not restrict setpoint access via serial communica

tions.

The relay has a programmable passcode setpoint which may be used to disallow setpoint changes from both

the front panel and the serial communications ports. This passcode consists of up to 8 alphanumeric charac

ters.

The factory default passcode is “0”. When this specific value is programmed into the relay it has the effect of

removing all setpoint modification restrictions. Therefore, only the setpoint access jumper can be used to

IS200VCMIH2 restrict setpoint access via the front panel and there are no restrictions via the communications ports.

When the passcode is programmed to any other value, setpoint access is restricted for the front panel and all

communications ports. Access is not permitted until the passcode is entered via the keypad (for the front

panel) or is programmed into a specific register (via communications). Note that enabling setpoint access on

one interface does not automatically enable access for any of the other interfaces (i.e., the passcode must be

IS200VCMIH2 explicitly set in the relay via the interface from which access is desired).

A front panel command is available to disable setpoint access once all modifications are complete. For the

communications ports, access may be disabled by writing an invalid passcode into the register previously used

to enable setpoint access. In addition, setpoint access is automatically disabled on an interface if no activity is

IS200VCMIH2 detected on that interface for a period of thirty minutes.

The 750/760 PC Program, included with the relay, incorporates a facility for programming the relay’s passcode

as well as enabling/disabling setpoint access. For example, when an attempt is made to modify a setpoint but

access is restricted, the program will prompt the user to enter the passcode and send it to the relay before the

setpoint is actually written to the relay. If a SCADA system is used for relay programming, it is up to the pro

grammer to incorporate appropriate security for the application.

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