Accessing the cyclic data at runtime, Data types – Flowserve MX/QX Profibus DP/PA Field Unit User Manual
Page 69
69
PB DPV1 / PA Field Unit Installation and Maintenance FCD LMENIM2336-03 – 12/12
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Channel 357 – Actuator Position Channel (Index 117)
The valve position is in units of 0-100% of open.
Channel 358 – Analog Input 1 (Index 118)
The 4-20 mA user input is reported in units of 0-100%.
Channel 359 – Analog Input 2 (Index 119)
The 4-20 mA user input is reported in units of 0-100%.
PROFIBUS Function Block Cyclic Parameter Descriptions
The MX/QX PB device contains eight “slots.” Each slot contains a specific block type. The host can
configure which parameter in each of these blocks are used for cyclic data. Below are the slots and
their associated block type with the default channel number for that block.
The module type for each slot is fixed, i.e., Slot 1 can only contain an Analog Output.
Slot Number
Slot Assignment
Factory Default Value
Channel Number
Slot 1
Analog Output
AO_CTRL_FLOW_CHAN
344
Slot 2
Discrete Input
DI_POSITION_AND_BUS_MODE
347
Slot 3
Discrete Input
DI_ACTUATOR_FUALTS_1_CHAN
349
Slot 4
Discrete Input
DI_ACTUATOR_FUALTS_2_CHAN
350
Slot 5
Discrete Input
DI_ACTUATOR_ALARMS_CHAN
351
Slot 6
Discrete Output
DO_POSITION_CHAN
354
Slot 7
Discrete Output
DO_ESD_CHAN
355
Slot 8
Analog Input
AI_POSITION_CHAN
357
NOTE: Any slot may be replaced with a “place holder” (EMPTY_MODULE) if no cyclic data from this
block is desired.
Accessing the Cyclic Data at Runtime
The cyclic data that can be read or written by a host must be done using “consistency”, that is, the
data must be transferred in a fixed order. Refer to your host software manuals for proper consistent
data transfer techniques.
Data Types
Structure Type
Definition
Floating Point (DS-33)
Consists of four bytes of value data and one byte of status data.
Discrete (DS-34)
Consists of one byte of value data and one byte of status data.
NOTE: The CHECKBACK parameters contain three bytes that are bitwise coded.