Norgren VP51 DeviceNet Installation Instructions Manual de usuario descargar pdf (Pagina 6)

6. DEVICENET INTERFACE DETAILS

I/O Data

Name I/O Type

(see Note 1)

No. Bytes Format

Demand Pressure Polled Output 2 12 bit integer (0 to 4095)

0 = minimum (zero) pressure

4095 = full scale output + 5% span

(see Note 2)

Actual Pressure Polled Input 2 12 bit integer (0 to 4095)

0 = minimum (zero) pressure

4095 = full scale output + 5% span

(see Note 3)

Status Byte Polled Input 1 Bit 0: Set if difference between Demand

Pressure and Actual Pressure exceeds Error

Limit (see parameter 10).

Bit 1: Set if Bit 0 has been set for longer

than Error Delay (see parameter 11).

Bit 2: Set if Actual Pressure ≥ Threshold A

(see parameter 12).

Bit 3: Set if Actual Pressure ≥ Threshold B

(see parameter 13).

Bits 4-7: Not used.

(See Note 3)

Notes

1) Inputs and Outputs are defined from the perspective of the DeviceNet network.

2) For 150 psi variant Demand Pressure value= 26 x (Required Pressure in psi), e.g. to output 100 psi, set

Demand Pressure value to 2600.

For 10 bar variant Demand Pressure value = 390 x (Required Pressure in bar), e.g. to output 6 bar, set

Demand Pressure value to 2340.

IMPORTANT - Only 12 of the 16 bits in the two Demand Pressure bytes are used. The four most

significant bits are ignored. Setting the Demand Pressure value above 4095 or below 0 may lead

to unpredicted output pressures.

3) If the polled input is read as a single value of 3 or more bytes, the two least significant bytes hold the

actual pressure and the third least significant is the status byte. For example, a returned value of

266044 (0x040F3C) represents an actual pressure of 0x0F3C = 3900 = 100% full scale and a status

byte of 0x04 = bit 2 set.

DeviceNet Parameters

The following parameters are available via a DeviceNet configuration tool (e.g. RSNetworx) or via DeviceNet

explicit messaging, using the class, instance, attribute and byte length details in the table. To use a DeviceNet

configuration tool, it is necessary to register the DeviceNet VP51 EDS file on the configuration tool. The EDS file

can be downloaded from

www.odva.org

Parameter

No.

Name Format Default

Value

Class

Instance

Attribute

Byte

length

1 Baud Rate Selectable from:

Autobaud, 125Kb/s, 250Kb/s,

500Kb/s (see note 1)

Autobaud 3 1 2 1

2 Serial

number

Read only 4 byte integer Factory

set

1 1 6 4

3 Demand

Pressure

Read only integer, 0-4095

0 = minimum (zero) pressure

4095 = full scale output + 5%

span

(same as polled output, see

note 2)

- 3 1 114

(0x72)

1 2 3 4 5 6 7 8 9 10 11

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Norgren VP51 DeviceNet Installation Instructions Manual de usuario Pagina 6

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