GE 8620-FT-MT Field terminal assembly
8220-DI-IS• 16 single-ended input channels
• Intrinsically safe field circuits
• Simple apparatus, dry contacts
or IS proximity detectors
• Open and short-circuit
field wiring detection
MODULE SPECIFICATION
See also System Specification
INPUTS
Number of channels
• 16
OFF current
• <1.2 mA
ON current
• >2.1 mA
Switching hysteresis
• 200 μA (nom.)
Applicable specifications
• NAMUR, DIN19234
Voltage applied to sensor
• 7.0 to 9.0 V from 1 kΩ ±10%
Output (wetting) current
• @ 100Ω line impedance
• >6 mA
Line fault detection
• Short circuit
• <100 Ω
• Open circuit
• >90 kΩ
Maximum input frequency in pulse counting mode
• 20 Hz
Minimum pulse width detected
• 45 ms
CONFIGURABLE PARAMETERS
Selectable input filter
• Fast, slow or user defined
(User defined permits 0 to 512 ms values in 3ms steps)
Latch inputs
• Enable / Disable
Latch polarity
• Latch on high / latch on low
Pulse counting
• Enable / Disable
Line fault detection
• Enable / Disable
RESPONSE TIME
Field event to availability on Railbus
• 6 ms (max.)
SAFETY
Field wiring protection
• [EEx ia] IIC
Safety Description (each channel)
• Uo
= 10.5 V, Io
= 14 mA, Po
= 0.04 W
FM Entity parameters
• VOC ≤ 10.5 V dc, ISC ≤ 14 mA
• Ca
≤ 2.67 μF, La
≤ 176 mH
Isolation
• Any channel to Railbus) – 60 V ac
(channels arranged in two groups of eight, with returns commoned
within each group)
POWER SUPPLIES
IS Railbus (12V) current
• (16-channel mode) – 350 mA (max.)
• (8-channel mode) – 285 mA (max.)
MECHANICAL
Module Key Code
• B1
Module width
• 42 mm
Weight
• 170 g

8215-DO-IS
• 4 single-ended output channels
• Intrinsically safe field circuits
• Solenoid valves and alarms or
LED indicators
• Line-fault detection
MODULE SPECIFICATION
See also System Specification
Number of channels
• 4
Minimum output voltage
• Open circuit – 22 V
• 45 mA load – 11 V
Maximum output voltage
• 25 V
Current limit per channel
• 45 mA (min.)
Output supply ripple
• <0.5% of output (pk. to pk.)
Line fault detection
• Short circuit – <15 Ω
• Open circuit – >13 kΩ
Isolation
• Any channel to Railbus – 60 V ac
• Between channels – None
CONFIGURABLE PARAMETERS
Output initialisation state
• High / low
Output state on “fail-safe”
• High / low / last value
Channel status
• Active / Inactive
Operation mode
• Static / dynamic
Output
• Discrete / momentary pulse / continuous pulse
Pulse width
• 2 ms to 130 s
Duty cycle
• 2 ms to 130 s (0.01% to 99.99%)
Line fault detection
• Enable / Disable
RESPONSE TIME
Railbus command to output change
• 10 ms (typ.)
SAFETY
Field wiring protection
• [EEx ia] IIC
Safety description (each channel)
• Vo
= 25 V, Io
= 110 mA, Po
= 0.69 W
FM Entity parameters
• VOC ≤ 25 V dc, ISC ≤ 110 mA
• Ca
≤ 0.19 μF, La
≤ 3.15 mH
POWER SUPPLIES
• IS Railbus (12V) current – 560 mA (max.)
• Power dissipation within module – 3.7 W (max.)
MECHANICAL
Module Key Code
• B5
Module width
• 42 mm
Weight
• 220 g