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3.6. Connections at the Field terminal block
Field terminal blocks are mainly used for option access at the customer site. Some interfaces are
provided on IOB, ISM, and VFD. Customers can choose flexibly. The specific interface information refers
to the following table:.
*1：if ISM Input enable = Disable
*2：if ISM Input enable = Enable
*3：If IOB3 is enabled
*4：If IOB4 is enabled
*5：Channel need to be configured by VFD Explorer
3.7. LEN/CCN/MODBUS Communication Cable Requirements
The electrical characteristics of the transmission Cables shall be comprised of three conductors, (1.5 Pairs)
two signals and one ground of 20 AWG or larger with 100% shield plus a tinned copper braid (65% coverage),
embodied as one of the following types is recommended by Carrier:
* Belden #8772 (for intra-building, 60 deg C)
* Belden #85240 (high temperature, 150 deg C)
* Belden #89418 (plenum cable, 200 deg C)
When LEN-MODBUS gateway which described in section 3.1.4 is used in the system for the retrofit, the
communication cable for LEN and MODBUS sides should also follow this requirement.
The communication cable between ISM and IOB should be as far away from high voltage cable and other
disturbance equipment as possible. The communication cable should be as short as possible and should
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