Norgren VP51 DeviceNet Installation Instructions - Manual (Page 6)

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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
Id Instance
Id Attribute
Id 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)
2