Communications Setup - nvent 910 Series Installation, Operating And Maintenance Instructions

5.6 COMMUNICATIONS SETUP

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Range: 0 to 999999 off-to-on transitions
Procedure: Adjust the CONTACTOR ALARM setting to the desired value. Note that the CON-
TACTOR ALARM must be enabled in order to adjust the CONTACTOR ALARM setting.
IMPORTANT: The CONTACTOR ALARM is only available if the SWITCH CONTROL MODE is set
to either DEADBAND or PROPORTIONAL AMBIENT CONTACTOR.
5.5.24 EEROM DATA FAILURE ALARM
Purpose: The EEROM DATA FAILURE ALARM indicates that the controller has detected a failure
in its nonvolatile memory.
Alarm Mask: ENABLE or DISABLE
Procedure: Enable or disable alarming of a nonvolatile memory failure as desired.
IMPORTANT: The EEROM DATA FAILURE ALARM should always be enabled. This memory
stores
all of the controller's configuration and calibration settings and the alarm will only be generated
if the microprocessor cannot bypass the failed area of its memory. This indicates an internal
problem and the 910 should be replaced and returned to the factory for repair.
The following section describes the setup parameters that relate to the way in which the
controller is to communicate with another device. If the optional communications interface is
not installed in the 910 Control Module, these parameters need not be configured.
5.6.1 PROTOCOL
Purpose: Defines the communications language used by the controller to communicate with
other devices.
Setting: HTCBUS™ or MODBUS ASCII or MODBUS RTU
Procedure: Select the HTCBUS™ protocol when communicating with existing PYROTENAX
Heat Trace Control products, including the Model 780/GCC-9000 Group Communications
Controller.
If you are communicating directly with the controller using a different device, select the
MODBUS protocol. For a detailed description of the controller's MODBUS mapping please refer
to 910 Series Heat Trace Controller—Modbus Protocol Interface document.
5.6.2 HTCBUS ADDRESS
Purpose: Defines the communications address to be used by the controller when using the
HTCBUS™ protocol to communicate with a Model 780/GCC-9000.
Range: 1 to 16,777,215
Procedure: Set the communications address as desired. This must be an address unique to
the entire communications network to avoid messaging conflicts. The HTCBUS™ protocol must
be selected in order to set the HTCBUS™ ADDRESS.
IMPORTANT: A unique HTCBus™ communications address is always assigned by the Factory
and identified by the label on the top of the controller module (see Fig. 2.1). It is recommended
that the pre-assigned address be used whenever possible to minimize the chances of an
address being duplicated in the user's system.
5.6.3 MODBUS ADDRESS
Purpose: The MODBUS ADDRESS along with the MODBUS SUB ADDRESS define the
communications address to be used by the controller when using either MODBUS protocol to
communicate with a MODBUS compatible device.
Range: 1 to 247
Procedure: Set the communications address as desired. Together with the MODBUS SUB
ADDRESS, this combination must be unique to the entire communications network to avoid
messaging conflicts. Either MODBUS protocol must be selected in order to set the MODBUS
ADDRESS.