Hardy Process Solutions C Series, Руководство по эксплуатации и установке, Страница: 35 / 92

Chapter 4 - Setup
4-5
Remote Mode of
Operation
For 1746 modules used in the remote chassis, direct
mapping of the parameters to the M files is also avail-
able. You can write to a specific location in the M0
file, do a single Executable command, such as com-
mand 4 to write non-volatile, and the 1746 will pick
up the change and apply it to the weigh module and
reflect the change in the M1 file.
NOTE: After making the change you need to save it to non-
volatile memory.
The 1746 module is limited to 8 words total for any
read or write at any time, so you are limited to chang-
ing a maximum of 7 words at a time. The mapping is
the same as listed above for the local chassis.
M File Interface to Set
Up for Local Mode of
Operation
CAUTION: THIS SETUP INFORMATION IS FOR THE
LOCAL MODE OF OPERATION ONLY.
BEFORE SETTING UP FOR LOCAL MODE OF
OPERATION CHECK TO BE SURE THE
JUMPER IS SET FOR LOCAL MODE AND
THAT THE MODULE IS INSTALLED IN A
LOCAL SLC CHASSIS. (SEE CHAPTER 3, PG
3-2 FOR MORE INFORMATION)
M File Data
Structure (Words 0
to 5) 0 Sequence Number (sequenceNum) is used to
control the flow of commands to the HI 1746-WS
module in order to prevent duplicate or invalid
commands. To write a command to the module,
the processor must copy the current sequence
number from the M1 file to the M0 file. When the
module performs the requested command, it
writes the response into the M1 file, incrementing
the sequence number by 1. To get the sequence
number from the module, a read command
should be used before a write command to
retrieve the next number from the module.
1 Command is used to select the command to be
performed. Enter the command from the Com-
mand List.