GE IS200VTCCH1B IS200VTCCH1BBB Mark VI thermocouple input board

Description

GE General Electric Technical Specifications: IS200VTCCH1B

The 750/760 has a powerful feature, called the User Map, which allows a computer to read up to 120 non-con

secutive data registers (setpoints or actual values) by using one Modbus packet. It is often necessary for a

IS200VTCCH1B master computer to continuously poll various values in each of the connected slave relays. If these values are

scattered throughout the memory map, reading them would require numerous transmissions and would burden

the communication link. The User Map can be programmed to join any memory map address to one in the

IS200VTCCH1B block of consecutive User Map locations, so that they can be accessed by reading these consecutive locations.

The User Map feature consists of User Map Addresses #1 to #120 at locations 0180h to 01F7h in the Memory

Map. These are the setpoints which store the memory map addresses of the values that are to be accessed.

The data registers are read from the User Map Values #1 to #120 at locations 0100h to 0177h in the Memory

Map. Reading the register at the location of User Map Value #1 returns the value at the address stored in User

Map Address #1, User Map Value #2 the value at User Map Address #2, and so on. Storing registers is not

allowed using the User Map.

The following table shows the register addresses to store in the User Map Addresses #1 to #6 so that several

different data registers can be read in one continuous block from User Map Value #1 to #6. Reading the User

Map Values is done via function code 03h or 04h.

The 750/760 Memory Map describes all the data registers that can be accessed via serial communications.

The IS200VTCCH1B Memory Map address range is grouped into several categories as outlined in the following table. All mem

ory map locations are two byte (16 bit) values. The remaining pages of this chapter list all locations of the

Memory Map. Addresses for all locations are shown in hexadecimal. Consult the range, step, units, and the

IS200VTCCH1B data format (listed after the memory map) to interpret register values.

Many Modbus communications drivers add 40001d to the actual adresss of the register

addresses. For example, if address 0h was to be read, then 40001d would be the address

required by the Modbus communications driver; similarly, if address 320h (800d) was to be

read, then 40801d would be the address required by the Modbus communications driver.

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