9289900992 Rev F BE1-851 Modbus™ Protocol 3-1
SECTION 3 • REGISTER DETAILS
INTRODUCTION
This section details the register formats and data ranges of the previous section. The two sections
combined provide all information necessary to communicate with the BE1-851 Modbus™ Holding
Registers.
Any Holding Register not listed in the Register Table is an unassigned Holding Register. A value of zero
always results when reading an unassigned Holding Register. Writes to unassigned Holding Registers
are legal, but no action will be taken (the write is ignored).
Logic Settings
Logic settings consist of a combination of modes, masks, terms, and term counts. Logic modes are
specific to each logic set, while the masks, terms, and term counts have value definitions consistent
throughout all logic sets. A single logic equation consists of a “mask” and “term” pair. The logic “term
count” is used only in VOA, VO1 - VO15 virtual output logic blocks.
The logic “mode” enables or disables the logic equation for that logic block.
The logic “mask” corresponds to the System Status bits to be evaluated. These bits are referenced in the
desired logic equation and are set to 1 (non-used bits masked out as 0‘s).
The logic “term” corresponds to the System Status bit’s TRUE or FALSE state referenced in the desired
logic equation where only the TRUE bits in the equation are set to 1.
The logic “term count” may be of one of four logic types which are NONE (logic disabled), OR only (a + b
+ c), AND only (a ∗ b ∗ c) or MIXED (a ∗ b + b ∗ c).
The following defines all logic set parameters:
Logic Modes
41505 Programmable 50TP Block Logic Mode INT
41522 Programmable 50TN Block Logic Mode INT
41539 Programmable 50TQ Block Logic Mode (250TN, “G”) INT
41556 Programmable 150TP Block Logic Mode INT
41573 Programmable 150TN Block Logic Mode INT
41590 Programmable 150TQ Block Logic Mode (350TN, “G”) INT
Read and Write:
0 for disabled
1 for enabled
41658 Programmable Breaker Failure Logic Mode INT
Read and Write:
0 for disabled
1 for enabled
41691 Programmable 51P Logic Mode INT
41708 Programmable 51N Logic Mode INT
41725 Programmable 51Q Logic Mode (151N, “G”) INT
Read and Write:
0 for disabled
1 for enabled
41844 Programmable 62 Timer Logic Mode INT
41877 Programmable 162 Timer Logic Mode INT
Read and Write:
0 for disabled
1 for Pickup/Dropout
2 for One-Shot Non-Retriggerable
3 for One Shot Retriggerable
(92 pages)
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