Keyence DL-PD1 Manual do Utilizador descarregar pdf (Página 47)

3-5 Overview of PROFIBUS DP Communication

3-25

- PROFIBUS DP Compatible Network Unit DL-PD1 User's Manual (IG) -

Executing Communication

Reading comparator values (P.V. values) from sensor amplifiers

Comparator values (P.V. values) can be read only in the monitor mode. They cannot be

read in the I/O mode.

"Operation mode of DL-PD1" (page 3-6)

 Example of reading the comparator value (P.V. value) from the sensor

amplifier

This example shows how to read the comparator values (P.V. values) from the sensor

amplifiers ID01, ID02, and ID03.

(1) When the comparator value of a sensor amplifier is updated, the value of the input

octet is also updated via cyclic communication.

If the comparator value is correct, the parameter range is -99.999 to +99.999.

(-999.99 to +999.99 in 2-head mode)

If the comparator value is over range, under range, or invalid, the previous value is

retained without updating the comparator value. To confirm whether the current

value is correct, use the comparator value property.

(2) The comparator value invalid, comparator value over range, or comparator value

under range is entered.

If the comparator value of a sensor amplifier is "invalid", "over", or "under", the bit

corresponding to the ID number of that sensor amplifier flips to 1.

(1)

Master

Comparator value under range

Input octet 3/10/17 Bit 3 of Slot 1/2/3

Comparator value of ID 01

1234 4567 6789

Input octet 5 to 8 (DEX) of Slot 1

Comparator value of ID 02

2345 5678 7890

Input octet 12 to 15 (DEX) of Slot 2

Comparator value of ID 03

3456 8901

Input octet 19 to 22 (DEX) of Slot 3

Sensor amplifier

Comparator value of ID 01

1234 4567 6789

Comparator value of ID 02

2345 5678 7890

Comparator value of ID 03

3456 8901

Comparator value over range

Input octet 3/10/17 Bit 2 of Slot 1/2/3

Comparator value invalid

Input octet 3/10/17 Bit 1 of Slot 1/2/3

(2)

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 73 74

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