GE IS200VSPAH1A Speedtronic Turbine Control PCB IS200VSPAH1AAA board

Description

GE General Electric Technical Specifications: IS200VSPAH1A

This function code allows the master to read one or more consecutive data registers (actual values or set

points) from an 750/760. Data registers are always 16 bit (two byte) values transmitted high order byte first.

The IS200VSPAH1A maximum number of registers that can be read in a single packet is 120. See the section MEMORY MAP

for exact details on the data registers.

Since some PLC implementations of Modbus only support one of function codes 03h and 04h, the 750/760

interpretation allows either function code to be used for reading one or more consecutive data registers. The

data starting address will determine the type of data being read. Function codes 03h and 04h are therefore

identical.

The IS200VSPAH1A following table shows the format of the master and slave packets. The example shows a master device

requesting 3 register values starting at address 200h from slave device 11; the slave device responds with the

values 555, 0, and 100 from registers 200h, 201h, and 202h respectively.

The time and date of multiple relays on the same communication link can be synchronized so that time stamp

ing of events on different relays can be correlated. The following procedure describes how to synchronize the

IS200VSPAH1A clocks of multiple relays. Since the clock is accurate to 1 minute per month, performing this procedure every 10

minutes will result in synchronization accuracy of ±10 ms.

1. Store values for the date and time setpoints Set Date and Set Time at locations 1006h and 1008h in the

Memory Map respectively into each slave device.

2. Broadcast (via slave address 0) the SET DATE operation code via function code 05h to all connected

slaves to synchronize the dates.

3. Broadcast (via slave address 0) the SET TIME operation code via function code 05h to all connected

slaves to synchronize the times. If synchronizing to an external clock source then this command should be

sent when the time is equal to the value stored in SET TIME.

The following table shows the format of the master and slave packets for a master device storing the date of

June 10, 1994 and time of 2:15:30 PM to slave device 11 as required by step one of the procedure.

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