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At this time, the indicator can only act as a slave on the Modbus ( network.
Operation of the 60 Series instrument as a master may be considered
sometime in the future if there is deemed to be significant demand for this
capability.
S
M
PECIFYING
ODBUS
P209 "MbAdX": This parameter is used to specify the Modbus address
which is recognized by the indicator on the current serial port, as specified
by the 'X'. If P205 is not set for "Modbs" then P209 is not accessible. Enter
a value between 1 and 247, or press [ENTER] alone to increment the
address by one until the desired address is displayed.
M
"I
ODBUS
NPUT
When a Modbus command is used to turn on or off an input setpoint above
#128, the setpoint's current state is not tested or affected. Therefore, if the
setpoint invoked a macro when it turned on, it would still invoke the macro
even if the setpoint should have already been on.
The input type setpoints will not work correctly for setpoints 129-144 due
to the way PDIO input setpoints are handled. Recommend only using
setpoint inputs above 144 if invoking macros via Modbus.
In other words, a macro may be invoked via a Modbus command via the
following method: Choose a setpoint above 144 and set it up as an input
type that invokes the desired macro upon activation and/or deactivation.
When a Modbus command is received to activate or deactivate that
setpoint, the macro will be invoked.
M
P
ODBUS
ROTOCOL
RTU (Remote Terminal Unit) messaging framing is used on a Modbus
network in place of ASCII message framing. With this method of framing,
each 8-bit byte in the message contains two 4-bit hexadecimal characters.
The main advantage of this mode over ASCII is that there is greater
character density allowing better data throughput for the same baud rate.
Note: The following information pertains to setting up the 60 Series for
Modbus networks with RTU framing. The following examples are 60
Series setups for slave operation on a Modbus network with RTU framing.
To make use of this protocol with the 60 Series requires existing
knowledge of the Modbus protocol. For any further information on Modbus
Protocol and ASCII & RTU framing, refer to the following document.
Modicon®, Modbus Protocol Reference Guide, PI-MBUS Rev. G
Notes on Using MODBUS RTU on 60 Series instruments :
Works only on comm port 1
8 data bits are forced regardless of P201.1
Flow control is forced to none regardless of P204.1 (also forced now for
ASCII mode)
Setup mode:
A
DDRESS
" S
ETPOINTS
(RTU M
ODE
60 Series Technical Reference Manual
Communications 8-27
)
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