User Manual

2–4 Command Word/Bit Descriptions
Publication 1771-6.5.88 – July 1997
Notes: 1. For [ ] engineering units, see page 3.
2. When using the Inject/Clamp/Eject mode, all pressure readings are system pressure at input 2, except where noted.
If you omit any of these three requirements, the QDC module rejects
some of the defined command blocks and inhibits some of the defined
status blocks because the module cannot use or generate block
parameters without data from a critical input which may have been
excluded during configuration. If you attempt to download an unusable
command block from the host processor, the QDC module treats it as
unrecognizable and discards the data. It does so in the same manner as
if it had received a command block containing an undefined Block ID.
Command Blocks for system level control are:
Block Description
MCC Module Configuration Command Block
JGC Jog Configuration Command Block
DYC Dynamic Command Block
You must establish the QDC module’s I/O configuration before it can
decide which command blocks to support. Although the module always
accepts the Module Configuration Command Block (MCC), the module
considers all other command blocks unrecognizable until it has received,
processed, and successfully error checked an MCC download from the
host processor. After you configure the QDC module with a valid MCC,
the module always accepts and processes (considers them recognizable)
either of the two basic command blocks JGC and DYC when received.
The module reports system status in the system status block (SYS). The
module can always return the System Status Block to the host processor.
It returns this block after each block transfer read (BTR) request from the
PLC processor unless the previous block transfer write (BTW) to the
module was a valid dynamic command block (DYC) containing a request
for some other status block.
The host processor can write any of these command blocks to the
QDC module to control ram (screw) position:
Command
Block
Description
Corresponding
Status Block
INC Injection Configuration Block –
IPC Injection Profile Block IPS
PKC Pack Configuration Block –
HDC Hold Configuration Block –
HPC Pack/Hold Profile Block HPS
PRC Pre-decompression Configuration Block –
PLC Plastication Configuration Block –
PPC Plastication Profile Block PPS
PSC Post-decompression Configuration Block –
PTC Process Trace Configuration Block PTS
RLC Inject ERC Values Block RLS
Data Blocks for System
Control
Data Blocks for
Controlling Ram (Screw)
Position