4. Series 8 IOTA Pinouts
4.1. HART/Non-HART Analog Input IOTA (Models 8X-TAIXA1, 8X-TAIXB1)
56
Series 8 I/O User's Guide
R500
Honeywell
April 2017
Note:
TB1is performed through a 145 ohm resistor inline with a Positive Temperature
Coefficient (PTC) device that acts like a fuse (but does not require replacement). Thus,
these field terminals can be permanently shorted to ground without damage. This is an
improvement over Process Manager due to the inclusion of the PTC device.
Analog Input wiring reference table
The following table summarizes the possible Analog Input wiring connections.
Table 12 Summary - Analog Input wiring connections
Input style
Connection characteristics
Standard 2-wire transmitter
Can use any of the 16 channels.
No custom wiring required.
Standard self-powered transmitter
Can use any of the 16 channels.
No custom wiring required.
Self-powered transmitter with loop
power (system ground)
Can use any of the 16 channels.
Custom wiring is required for channels 1-12:
you must find a screw terminal at Series 8
ground for one leg of the transmitter.
Self-powered 3-wire transmitter (system
ground)
Can use any of the 16 channels.
Custom wiring is required for channels 1-12:
you must find a screw terminal at Series 8
ground for one leg of the transmitter.
Allowable field wiring resistance
The maximum allowable field wiring resistance between the transmitter and the IOTA
connection terminal is dependent upon the voltage requirement of the transmitter. The
formula for calculating the maximum wiring resistance for the Series 8 Analog Input is
provided by the following equation.
Rmax = [(13.0 - Vtx) / (0.022)]
where: Vtx = Voltage required at the transmitter terminal
IOTA board and connections
Series 8 Analog Input 6 inch, non-redundant IOTA and field wiring connection are
illustrated in the following figure.