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4.4.18 0x1031 MODBUS CONNECTION Mode Register
Bit
Name/Description
2 to 15
reserved
1
MB_ImmediateWritePermission
– 0: during the first write access, write authorization is requested for the corresponding Modbus connection. If
this is not successful, an exception response with the exception code 0x01 is generated. If it is successful,
the write access is executed and write authorization remains in effect until the end of the connection.
– 1: write authorization for the corresponding Modbus connection is already requested when the connection
is being established. As a result, the first Modbus connection receives the write authorization, and nothing
happens for all those that follow (as long as Bit 0 = 1).
0
MB_OnlyOneWritePermission
– 0: all Modbus connections have write authorization
– 1: in all cases only one Modbus connection can be assigned write authorization. Once assigned, write
authorization is retained until there is a disconnect. After the connection that has write authorization is
disconnected, the next connection which attempts write access receives write authorization.
4.4.19 0x1131 MODBUS CONNECTION Timeout in Sec
This register determines how long a Modbus connection must be inactive before it is ended with a
disconnect.
4.4.20 0x1132 Check Reference List prior to Data Exchange
If the value in register 0x1132 is set to 0, the data exchange begins without checking the reference
module list (0x2800 and the following) against the current module list (0x2A00 and the following). The
reference module list must also not be described.
If the value in in register 0x1132 is set to 1, the data exchange only starts if the reference module list
(0x2800 and the following) matches the current module list (0x2A00 and the following).
4.4.21 0x1133 Process Alarm
If the value in this register is set to 0, process alarms are reported, but it is not necessary to confirm
or read them. If the value in this register is set to 1, process alarms are reported and they must be
confirmed by reading the corresponding register.
4.4.22 0x1134 Diagnostic Alarm
If the value 0 is set in this register, the diagnostic alarm is deactivated. Pending diagnostics do not
have any effect on the exchange of process data and must not be confirmed. They are, however,
displayed locally on the RSTi-EP hardware with red LEDs (SF and module) and also can be read in the
module-specific diagnostic registers 0xAXXX.
If the value in this register is set to 1, diagnostics alarms are reported, and they must be confirmed by
reading the corresponding register.
4.4.23 0x1135 Field Bus or Reference List Error Behavior
If the value in this register is set to 0, in case of a field bus or reference list error all outputs are set to
0.
If the value in this register is set to 1, in case of a field bus error all outputs are set to the substitute
values.
If the value in this register is set to 2, in case of a field bus error all outputs are held at the last
process value.
4.4.24 0x1136 Module Removal Behavior
If the value in this register is set to 0, the exchange of process data continues.
GFK-2958E
Chapter 4 Detailed Descriptions of the Fieldbus Network Adapters
RSTi-EP User Manual
90
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