EPICS Support for G3FlexIOPLC5VSIOD8

1
EPICS Support for G3/FlexIO/PLC5/VSIOD8

• Carl Lionberger
• Group3 optical-fiber-connected I/O
• AB FlexIO I/O modules
• More AB PLC5 record support
• Janz VSIOD8 VME serial board

2
Group3 control system

• VME-Based fiber-optic loop controller
• 2 loops/VME bd, 8 bds/VME crate
• 16 DIs (Device Interface) / loop
• CNA 2 AI, 1 AO, 8BI, 8BO
• Has PID (not supported)
• CN3 CPU 3 I/O boards
• digital I/O, analog I/O, motor control
• Serial, gpib (not supported)
• Diagnostic Port on each DI

3
Group3 controls in a rack
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Group3 EPICS support

• CNA combination module
• Ai, ao, bi, bo, mbbi, mbbiD, mbbo, mbboD
• B digital module
• bi, bo, mbbi, mbbiD, mbbo, mbboD
• C 8 16-bit analog input ai
• D 8 12-bit analog output ao
• E 4-channel DC motor controller
• Mbbo for mode, ao for speed, accel
• G 4-channel stepper steppermotor record
• H 4-channel encoder ai, steppermotor record
• F dual-serial, diagnostic port vxWorks tty
  driver
• Loop Controller (status) ai, mbbi, mbbiD

5
Group3 EPICS support
Loop Controller
DI1
input PV
drvG3
Cache
Polling
DI2
Loop
30Hz
Output
PV
DI3
Per-DI semaphore
protected
Sequence-number
Device Support
concurrency control
Interrupt
vxWorks
IO Scan
tty driver
Queue
6
Group3 Diagnostic Port
7
EPICS Allen-Bradley 1794 FlexIO Analog record and
device support

• Analog support uses special record type for each
  module type
• Similar to 1791 record written by Marty Kraimer
• device supports allow ai and ao records to access
  the special records.
• Use dblink link type, like soft raw records
• Status as well as data passed by using long to
  pass 16 bit data status
• Support linear conversions
• Support 1794IE4XOE2, 1794IE8, 1794OE4, 1794IT8
• Use cp and cpp link types to get automatic
  updates of passive aos and ais.

8
FlexIO on a wall
9
FlexIO Combo module PV diagram
10
EPICS Allen-Bradley 1794 FlexIO Digital device
support

• 1794IB16 and 1794IV16
• bi, mbbi, and mbbiDirect PVs
• standard AB binary device support
• AB 16-bit BI
• 1794OW8
• bo, mbbo, and mbbiDirect PVs
• Standard AB binary device support
• AB 8-bit BO

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AbPlc5Record Allen-Bradley PLC-5 Record and
Device Support

• Patterned on AbDCMRecord by Marty Kraimer
• Special Record
• Each record does block transfer reads and/or
  writes to 1 or 2 files in PLC5
• Only 1 read file and 1 write file per record can
  be same
• Read-only, write-only, rw, init output from input
• Uses BTR and BTW pointers addressed by slot
  number in PLC
• No supporting ladder logic programming necessary
• Device Support
• Ai, Ao with or without conversion
• Bi, bo, mbbi, mbbo, mbbiDirect, mbboDirect
• Type flexibility
• Supports interrupt I/O scanning

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AbPlc5 Record Addressing
Record Name
AbPlc5
INST_IO Link

ltRecord namegtsubscript
Record
Supported Standard Record

This example uses the same
file for reading and writing.
subscript
2
16 bits
16 bits
3
....
63
16 bits
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Janz VSIO-D8

• VMEBus 8 channel serial I/O
• Uses Z8530 comm. controllers
• Baud to 38.4 k
• Not intelligent
• Serial ports either on front or back of crate
• Bought source for vxWorks tty driver and modified
  to do cts/rts flow control