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RX3i Serial Communications Modules
GFK-2461N
Restrictions and Open Issues in this Release
SPL
The module rejects a SPL program file containing a literal string of length greater than 127. The SPL port will
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return a status in the status byte of 61.
The static file checker can miss paired NEXT and FOR statements. If a NEXT statement is missing from the
2.
program, execution will continue without looping back to the FOR statement. Users should check their
FOR/NEXT statements before downloading. A missing NEXT statement can also be detected by debugging
using the CLI debug interface.
Other
Each port can be configured for DNP3 Master or DNP3 Slave protocol. If any port is configured for DNP3 Master
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or Slave, the other ports on the module can only be configured for DNP3 Master or Slave.
These modules do not support GE Intelligent Platforms special MODBUS commands for use with a Daniels Flow
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Computer.
PLC Reference Address and Reference Length parameters only allow bit based memory values that are aligned
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to a byte boundary.
For example, for a port using MODBUS Slave with coils mapped to %Q memory, the %Q memory address must
start on a byte boundary in %Q. (Target Address 1 can be mapped to %Q00001 or %Q00009, but it can not be
mapped to %Q00007.)
CCM Slave Read Scratchpad operations may fail when a port is configured for CCM Slave protocol and:
6.
▪
a new configuration is stored to the PLC using Machine Edition, or
▪
the system is power-cycled, or
▪
the module is hot-inserted
If the first query received from the CCM Master is a Read Scratchpad request, the module will reject that
request. All subsequent Read Scratchpad requests will be successful unless one of the above conditions occurs
again.
The DNP3 slave port has problems using the link layer to validate frame receipt. The DNP3 organization
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encourages users not to do this.
Change Event Read responses are not sent immediately after a Confirm to an unsolicited response.
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If a read request is received after sending an unsolicited response, the slave is required to wait to respond to
the read until either the unsolicited timeout expires, or the unsolicited message is confirmed.
The module waits until the timeout expires, even if the unsolicited message has been confirmed, to send the
read response.
Normally, messages are responded to within milliseconds, but the read response does not occur for up to 2
seconds after the confirm message is sent.
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