Initial Character Z Or X; Xh Or Zh - Binary Signals From A Limit Value Monitor - Siemens TXP-CLC Manual

Initial Character Z or X

If there are more than one switching elements connected to an input (hardwired
OR) then the initial character Z would be used. Figure 12 shows a > MAX signal
derived from two NOCs. The serial number assigned to this signal is ZG01. If
only one switching element is connected to an input then the initial character X is
used; this is shown in Figure 11.
NOC

XH or ZH - Binary signals from a limit value monitor

The signals created in this signal area are analog values that are monitored by a
limit value monitor. The analog signals are compared with a set-point for MIN or
MAX. The resulting signals from this type of comparison circuit are defined in the
XH signal area.
Serial number assignment for the signal area XH follow the same rules as for
serial numbers in the signal area XG.
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NOT
MAX
Level
Tank 1
Figure 12 - MAX Signal (Level) - ZG01
Training Center
TXP CLC Course
ZG01
MAX
Level
NCC
Tank 2