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5. Gateway Initialization and Diagnostics
The values of the EC and ED fields are described in the table below:
EC Description of the error ED Notes
2#0000 Re-transmissions on the
Modbus network
Number of re-
transmissions (1)
Total number of re-transmissions carried out
on the sub-network, for all slaves.
2#0001 A Modbus slave is missing Address of the missing
Modbus slave
—
2#0010 Several Modbus slaves
are missing
——
2#0011 Excessive data in a
Modbus response
Address of the Modbus
slave involved
This error occurs when the gateway receives too
much data in the response sent by one of its
Modbus slaves.
2#0100 Unknown Modbus error
Address of the Modbus
slave involved
—
(1) The re-transmission counter used to signal this error is not reset when the gateway generates this error
code. If there are recurrent communication problems on the Modbus network, the gateway will generate this
same diagnostic repeatedly, so as to tell the Profibus-DP master the total number of re-transmissions
carried out as often as possible. This counter is reset when its value exceeds its maximum value (counter
modulo 256: 16#FF Æ 16#00).
In the case of de-connection of one or several device on the Modbus sub-network, the LUFP7
gateway will first report re-transmission errors several times and then the error “A Modbus
slave is missing” or “Several Modbus slaves are missing”. Later on when the LUFP7 will
proceed to reconnection attempt, only the re-transmission error will be reported. Due to this,
the indication of the errors error “A Modbus slave is missing” or “Several Modbus slaves are
missing” may be perceived as very brief.
5.3. Diagnostic Only
The gateway uses a 16-bit register, located at the addresses 16#0000 and 16#0001 in its memory (inputs), to
send diagnostics to the Profibus-DP master. A second 16-bit register, located at the addresses 16#0200 and
16#0201 (outputs), allows the Profibus-DP to acknowledge each of these diagnostics.
So you must configure your Profibus-DP master so that it has access to the first two bytes of the
gateway’s output data area, as well as to the first two bytes of the gateway’s input data area (see
chapter 4.2 Gateway Configuration under PL7 PRO and SyCon, page 26).
5.3.1. Gateway Status Word
The input word located at addresses 16#0000 (MSB) and 16#0001 (LSB) in the gateway’s input memory
constitutes the gateway’s status word. Its structure is described below:
Bits Description
15
ABC_HS_SEND: New gateway diagnostic
(See description of bit 15 of the Profibus-DP master command word, FB_HS_CONFIRM.)
14 Reserved.