502 069 02
Manual
Power Monitor, PD 3260
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An example of the field values in the DeviceID record is shown below:
DeviceNumber = 3260
ProgramVersion= 100
(the first version)
ManufacturerNo = 1
Manufacturer = Proces-Data DK
SWNo 3: Reset
By writing $FF to SWNo 3, the module performs a reset, and ExternalReset in CommonError
SWNo $F is set TRUE.
SWNo 4: PnetSerialNo
This Variable is a record having the following structure:
Record
PnetNo: Byte; (* Node Address *)
(* Offset = 0 *)
SerialNo: String[20];
(* Offset = 2 *)
end
The serial number is used for service purposes and as a 'key' to setting the module's P-NET Node
address.
A special function is included for identifying a module connected to a network containing many
other modules, having the same or unknown node addresses, and to enable a change of the node
address via the P-NET.
Setting a new node address via the P-NET is performed by writing the required node address
together with the serial number of the module in question, into the PnetSerialNo at node address
$7E (calling all modules). All modules on the P-NET will receive the message, but only the
module with the transmitted serial number will store the P-NET node address.
An attempt to write data to node address $7E will give no reply. Consequently the calling master
must disable the generation of a transmission error when addressing this node.
In the module, the SerialNo = "XXXXXXXXPD", is set by PROCES-DATA, and cannot be
changed. The eight X`s indicate the serial number, and PD is the initials of PROCES-DATA.
SWNo 7: FreeRunTimer
FreeRunTimer is a timer, to which internal events are synchronized. The timer is of type
LongInteger, with a resolution of 1 /256 Second.
P-NET Watch Dog function
PD 3260 Digital I/O is equipped with a P-NET Watchdog, which switches off all the digital
outputs, by clearing OutFlags and Control flags, if P-NET communication ceases. The P-NET
watchdog uses SWNo 8 and SWNo $A.
