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DESCRIPTION AND OPERATION
FSK MODES OF OPERATION (IMFEC11 ONLY)
WBPEEUI240756A0
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security byte to the transmitter at the beginning of each trans-
mitter communication.
The security byte triggers the smart transmitters to take con-
figuration commands only from the module, unless the FEC
module turns the transmitter off-line. The security byte locks
out configuration commands from other operator interface
devices such as a Type STT03 smart transmitter terminal. All
devices can monitor the transmitter. When the transmitter
receives the security byte, it sets a two-minute timer. The timer
counts down until another command is received to reset the
timer. Normally the timer does not expire because the module
resets it before the two-minute timer expires.
NOTE: Type STT03 is referred to in this instruction. The information
also applies to Types STT02 and STT02E terminals. Differences are
noted as they occur.
In the event a module failure occurs, the transmitter timer
expires after two minutes. The transmitter resets itself and
receives configuration commands from other devices such as
the smart transmitter terminal.
FSK MODES OF OPERATION (IMFEC11 ONLY)
The IMFEC11 module has two operating modes: FSK field bus
mode and FSK analog point-to-point mode. Mode selection is
through FEC circuit board jumpers (J2 through J4). Function
code 132 must be configured in the MFP or MFC device for
every five analog inputs.
FSK Field Bus Mode
The FSK field bus mode allows pure digital communication
with Bailey-Fischer & Porter FSK smart transmitters on a bus
(Fig.
). Examples of the FSK line of smart transmitters are
the PTS and BCN smart pressure transmitters, EQN smart
temperature transmitter and Type TBN580 smart pH/ORP
smart transmitter. In the FSK field bus mode, all transmitters
reside on the field bus. The process variable signal from each
transmitter is sent to the FEC module in an FSK digital format.
Since all 15 input channels are FSK digital, no channel can
accept an analog input signal when the module is in this mode.
The NTFB01 terminals provide a bus to connect the FSK smart
transmitters to the FEC module. Function codes 132 and 133
must be configured in the MFP or MFC device for every five
analog inputs from each transmitter.
FSK Analog Point-to-Point Mode
The FSK analog point-to-point mode enables the IMFEC11
module to input standard analog inputs, such as four to 20
milliamp signals, and use digital communication with