P0917MG Foxboro Module Base

Description

Field I/O signals connect to the FBM subsystem via DIN rail mounted termination assemblies (TAs). Multiple types of TAs are available with FBMs to provide I/O signal connections, signal conditioning, optical isolation from signal surges, external power connections, and/or fusing for protection of the FBM and/or field device as required by the particular FBM. Since these features are built into the termination assemblies (where required), in most applications there is no need for additional termination equipment for field circuit functions such as circuit protection or signal conditioning (including fusing and power distribution).

The termination assembly can be used with a single FBM207 or with a redundant pair (two FBM207s). The DIN rail mounted termination assemblies connect to the FBM subsystem baseplate by means of removable termination cables. When used with a redundant module pair, the termination assembly is connected to the baseplate using a redundant adapter (P0926ZY). The DIN rail mounted TAs connect to the redundant adapter by means of a removable termination cable. The cables for both single and redundant configurations are available in a variety of lengths, up to 30 meters (98 feet), allowing the termination assemblies to be mounted in either the enclosure or in an adjacent enclosure. Refer to Table 2 on page 12 for termination cable part numbers and specifications.

The capacity of PLC includes two aspects: I/O points and user storage capacity.
（1） Selection of I/O points
The average price of I/O points in PLC is relatively high, so the number of I/O points in PLC should be reasonably selected, striving to use the least I/O points while meeting control requirements, but leaving a certain margin.
Usually, the I/O points are determined based on the actual needs of the input and output signals of the controlled object, plus a margin of 10% to 15%.

（2） Selection of storage capacity
The storage capacity required for user programs is not only related to the functionality of the PLC system, but also to the method of functional implementation and the level of program writing. An experienced programmer and a beginner may have a program size difference of up to 25% when completing the same complex function, so beginners should leave more margin when estimating storage capacity.
The number of I/O points in the PLC largely reflects the functional requirements of the PLC system. Therefore, based on the determination of I/O points, the storage capacity can be estimated using the following formula, and an additional margin of 20% to 30% can be added.
Storage capacity (bytes)=number of switching I/O points x 10+number of analog I/O channels x 100
In addition, while selecting storage capacity, pay attention to the selection of storage type.

VMIPMC-5588-310
VMIPCI-5588-005
VMIPCI-5588-105
VMIPCI-5588-411
VMIPCI-5588-101
VMIPCI-5588-212
VMIPMC-5588DMA-610
VMIPCI-5588-401
VMIPCI-5588-001
VMIPMC-5588-410
VMIPCI-5588-511
VMIVME-1101
VMIVME-1181-001
VMIVME-1181-000
VMIVME-7453-001
VMIVME-A09
VMIVME-A05
VMIVME-301A
VMIVME-9064/32-471
VMIVME-9064/32-461
VMIVME-FA3