Nor-Cal IQ+ Adaptive Pressure Controller - Manual (Page 19)

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I
ntellIsys
A
dAptIve
p
ressure
C
ontrollers
IQ+ OP-LIT 9/08
SSTechnology
interface card
SST 5136 DN
Tool
system
CAN_H
CAN_L
V+
V-
Drain
Interface
Card
Power
Supply
+24v
GND
IQ+ based
Controller 1
Controller 2
Controller 3
Other Devices
Cordset
InterlinkBT RSC572-*M
Drop Junction
InterlinkBT VB2-FKM FKM FSM 57
BUS
IQ+ based
IQ+ based
Power Supply System and Typical Configuration:
It is essential for the controller to have dedicated access to the pressure gauge.
Accordingly the preferred configuration is for the controller to host the gauge
through the analog signal link while the controller takes charge of reporting
the process parameter through the DeviceNet communication link.
The IQ+ controllers require external 24 VDC power for operation. This must
be applied to the XLR power port. The DeviceNet interface requires separate
power input via the DeviceNet cable connection. This DeviceNet link can be
powered from 11 to 24 VDC.
Required Hardware:
A DeviceNet network is composed of a host controller, a bus and one or more
external devices such as IQ+. The master node or host controller is commonly
composed of a computer equipped with a DeviceNet interface card. The bus
is made of cable connectors and junctions generally arranged in trunkline-
dropline configuration as shown in Figure 7.4.
Interface and bus system part numbers are given as indication only.
The IQD Controllers come ready to plug into any qualified DeviceNet network.
Prior to power up, you must initially:
1. Select the appropriate baud rate.
All the devices on the network must operate
at the same baud rate.
2. Select an individual device MACID that is
not already in use by another device.
IQ+ controller devices can be plugged in and removed from the network live,
however, if an inappropriate baud rate setting is selected it will bring the IQ+
controller to a network fault and possibly bring other installed devices on the
bus to a fault. Upon connection the IQ+ controller will transmit a duplicate
MACID check to verify the uniqueness of its address. If another device with
the same MACID address is detected the IQ+ Controller transitions to a red
network LED status.
FIGURE 7.4 - TyPICAL DEvICENET HARDWARE
INSTALLATION
General Considerations for valve Operation Using DeviceNet
DeviceNet is an object oriented communications protocol. The Process
Control Valve device type encompasses several objects from the
Hierarchy of Semiconductor Equipment Device Objects (see figure 9.1).
These objects are managed by the S-Device Supervisor Object, which
tasks include reporting device status. The interaction with the device can
be carried out in different ways. The Selection Object is a router object
which directs setpoint data to the desired destination – pressure control
or position control – via the S-Single Stage Controller Object. Instead of
setting a setpoint through the Selection Object, it can be set directly in
the S-Single Stage Controller Object. Process data is gathered from the
S-Analog Sensor Object, which provides pressure data from up to two
pressure gauges and valve position data. This document contains exam-
ples of how to set and get parameters through DeviceNet.
To be able to perform pressure or position control, the controller must
first be transitioned to the device Executing state. This can be done in
one of two ways; explicitly by means of executing a Start service request
or by sending valid polled I/O data to the controller. See the DeviceNet
Communications section for a more detailed description on how this is
done. See figure 9.2 for more details on device states.
Pressure control is performed based on the selected process variable
source. By default, the selection will be automatic based on the pres-
sure range that each pressure gauge covers. Setting a setpoint using
automatic switching will be relative to the high gauge range, if multiple
gauges are used. The source can be forced to either the low or the high
range gauge. When the source used is set to “automatic”, the source
actually reporting the pressure data can be retrieved through the S-
Analog Sensor Object.
Some Nor-Cal valves require initialization before they are ready for opera-
tion. Nor-Cal has an Initialize service designed solely for this purpose. See
S-Device Supervisor Object section for more information on which valve
models are affected.
7.1. Overview and setup (continued)