AMETEK ASD Series - Manual (Page 78)

Programming: Digital Interface Control Sorensen ASD Series
4-20 M551177-01 Rev A
Code Name Description
0x4000
FAULT_REPEATED_MODULE_SERIA
L
The master has more than one module ID with the same serial number.
0x8000 FAULT_OUTPUT_IMPEDANCE_ROC The output impedance rate of change has exceeded the maximum limit.
0x10000 FAULT_LOAD_CABLE_IMPEDANCE The load cable impedance has exceeded the maximum limit.
0x20000 FAULT_TOO_FEW_MODULES
The master is connected to less than the expected number of modules.
See user guide for more details.
0x40000 FAULT_MISSING_PHASE There is a phase missing from the AC input to the unit.
0x80000 FAULT_ANALOG_SHUTDOWN
Output enable pin at the analog port is not enabled and the unit was
enabled through digital interface.
0x100000
FAULT_ANALOG_PRG_IN_OVERLOA
D One of the analog programming inputs was overloaded with too high
current or voltage.
Table 4-12. Module_Information Register Bits
Bit Field Description
1 - 12 MODULE_BUS_ADDRESS
Contains the unique module bus address used for communications with
that module
13 - 16 Not used
4.5 MODBUS COMMUNICATIONS
The Modbus protocol specification can be downloaded from
www.modbus.org. The following is a brief description of Modbus protocol
taken from the same website:
“Modbus is an application-layer messaging protocol, positioned at level 7
of the OSI model. It provides client/server communication between
devices connected on different types of buses or networks.
The de facto industrial serial standard since 1979, Modbus continues to
enable millions of automation devices to communicate. Today, support for
the simple and elegant structure of Modbus continues to grow. The
Internet community can access Modbus at a reserved system port 502 on
the TCP/IP stack.
Modbus is a request/reply protocol and offers services specified by
function codes. Modbus function codes are elements of Modbus
request/reply PDUs. This protocol specification document describes the
function codes used within the framework of Modbus transactions.”