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5.19.2.4. Selecting remote device parameters
The communication block parameters determining the
objects in the remote device are:
• NODE:
remote device node
• NODE_MAX:
maximum remote device node (for
ACCESS=WRITE_ONLY only in the case
of multi-node writing from NODE to
consecutive NODE_MAX)
• ADDRESS:
Modbus address of the object in the
remote device to be read and/or written
with the variable
• TYPE:
type of object in the remote device
• ACCESS:
type of object access in the remote
device
• MIN:
minimum value of the object in the remote
device
• MAX:
maximum value of the object in the
remote device
• DEC.P:
position of the decimal point value of the
object in the remote device
• MASK:
bit mask of the object in the remote
device
• DESCRIPTION: description value of the object in the
remote device. The description will appear
on the instrument as a scrolling message
when the data appears in the "MASTE"
menu or the User menu.
TYPE parameter
The TYPE=WORD parameter is used to assess word data.
This data is shown in the MAS.xx parameter in the MASTE
menu or in the User Menu.
This data may be used in Math Function Blocks or
retransmitted on an analogue output.
In the case of ACCESS=WRITE_ONLY write access or
ACCESS=READ/WRITE access, the MIN...MAX limits apply
and the value written in the MAS.xx parameter and in the
slave are subject to these limits.
In the case of access in read-only mode, ACCESS=READ_
ONLY, the MIN...MAX limits still apply, and the value written
in the parameter MAS.xx , starting with the value read on the
slave, is subject to these limits.
The limits on the data appearing on the controller display are
between -1999...9999.
The TYPE=BIT parameter is used to assess bit data. This
data appears in the MAS.xx parameter in the MASTE menu
or in the User Menu.
This data may be used in Logical Function Blocks or
retransmitted on an analogue output.
The limits on the data are 0...1.
The TYPE=BIT(S) OF WORD parameter is used to assess
word data in AND with the MASK mask.
The result of the oforation appears in the MAS.xx parameter
MAS.xx nel menu MASTE oppure inserito nello User Menu.
This data may be used in Math Function Blocks or
retransmitted on an analogue output.
In the case of ACCESS=WRITE_ONLY write access or
ACCESS=READ/WRITE access, the MIN...MAX limits apply
and the value written in the MAS.xx parameter and in the
80209C_MHW_850-1650-1850_01-2020_ENG_pag. 243
slave are subject to these limits. In the case of access in
read-only mode, ACCESS=READ_ONLY, the MIN...MAX
limits still apply, and the value written in the parameter MAS.
xx , starting with the value read on the slave, is subject to
these limits.
The limits on the data appearing on the controller display are
between -1999...9999.
Example:
To assess bit3 in a word:
MASK=8 (0x08) and MAS.xx may take on the values
= 8 (bit3=1) or = 0 (bit3=0).
Volendo valutare il bit3 e il bit6 di una word:
MASK=72 (0x48) e MAS.xx potrà assumere i valori
= 72 (bit3=1 e bit6=1) oppure 64 (bit6=1) oppure 8
(bit3=1) oppure 0 (bit3=0 e bit6=0)
MIN and MAX parameters
The MIN and MAX limits are significant when the TYPE=WORD
parameter or the TYPE=BIT(S) OF WORD parameter and the
parameter:
- ACCESS=WRITE_ONLY or ACCESS=READ_WRITE: to
limit the value written on the slave.
- ACCESS=READ_ONLY: to set the limits on the scale if
the value is used as input for a Math Function Block or
retransmitted to an analogue output (if the MIN and MAX
limits are not taken into account, the dynamic of the output
is rescaled over a maximum range of [0...65535] points).
Example:
When reading a word with an effective range of [0...1000]
points, if it is to be retransmitted to an analogue output of
0-10V where 0 points=0V and 1000 points=10V, set MIN=0
and MAX=1000.
Warning! In order to be correctly displayed and
set in the controller, data read and written in the
slave must be within the range [-1999...9999].
In the case of TYPE=BIT(S) OF WORD, you
may therefore read and write from bit0 to bit12
[0...8191].
5.19.2.5. Selecting an internal variable to be retransmitted
In the case of a communication block with WRITE_ONLY
access, the instrument will send the remote device the value
of an internal variable selected through the OUT parameter.
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