Emerson Epsilon EP Drive 400518-01 Manual de instalación descargar pdf (Pagina 81)

Setting Up Parameters

When a User Bit Register (group of 32 User Bits) is written to, the value is then logic-AND’ed with the mask to determine

the resulting state of each of the 32 individual bits. If the individual bit value of the 32-bit mask is “1”, then the corresponding

bit from the written 32-bit parameter is passed through, and the resulting value stored in the specific bit will be the written

bit value. If the bit value of the 32-bit mask is “0”, then that particular bit is blocked (or masked), and the resulting bit value

does not change, (Original Value AND NOT 32-Bit Mask) or (Value Written over Network AND 32-Bit Mask). An example

of this is shown below.

Figure 64: Writing to the User Bit Register

The Mask is only used when WRITING to the 32-bit parameter, BitRegister.#.Value. When reading the 32-bit value, all bits

are read regardless of the mask.

Figure 65: User Bits Read/Write Process

01010101010101010101010101010101

10000001010000001000001000000000

015

Bit #31

01101000011110000111111101010110

11000000010100001101011101010100

Original

Value

Value written

over network

32-bit Mask

Result stored

in each bit

Network

Master

Write

Read

FM-3/4

Written data is AND’ed with the Mask

and then written into 32-bit Value.

Read data is read directly from the

32-bit Value and bypasses the Mask.

Mask

Value

AND

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 239 240

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Emerson Epsilon EP Drive 400518-01 Manual de instalación Pagina 81