isolated from the logic by bidirectional opto-couplers. The inputs are divided into 2
isolated groups of 8 inputs each. This allows for many configurations in which
the input module may be used. One such configuration could be where one group is
connected as common positive and the second group connectedas common

The counters operate in three modes.

In mode 0: All the counters are disabled.

In mode 1:
The counters are 32 bit counters allowing a count value from
0 to 4294967295. The count value can be cleared by writing a zero to the associated
registers or preset to any other value using the same method.

In mode 2:
The inputs are connected as up/down counters. Input 1 will increment counter 1
whilst input 2 decrements counter1.
In the same way, inputs 3&4 operate counter 2, inputs 5&6 operate counter 3 and
inputs 7&8 operate counter 4,etc.

Note: The count values are not battery backed-up and will be lost if power is turned
off. The format of the registers allows the status of the inputs to be read as either
single bits or all at once as a single register on the Modbus network.
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