MODBUS Interface
F-16 Verbatim Owner's Manual
3. If the RC specified as destination is already configured as the destination
for another source, then the new configuration supersedes the old one. No
error message is given. This prevents the configuration of multiple
sources for a single destination. The user must take care that distinct
destination channels do not have identical net addresses. Multiple
destinations for a single source are allowed.
4. If either the source or destination RC are “DISARMED”, then its criteria
will be reset to “NETERR”. This alteration will be announced. All other
existing criteria are accepted without alteration. Once a link is configured,
any attempt to DISARM either the source or destination results in an error
message. All other criteria modifications are allowed. Note however that
it rarely makes sense to have destination criteria of anything other than
“NETERR” or “NOALARM”.
5. The linking of channels with different data types is allowed. For example,
it is OK to have a discrete source linked to an analog destination. Special
data conversion rules apply and are presented in the table below.
Conversion Rules
Source Dest. Destination Value
16 or 32 bit 1 bit 0 if source is 0, otherwise 1
1 bit 16 bit 0 if source is 0, otherwise 1
1 bit 32 bit 0.0 if source is 0, otherwise 1.0
16 bit 32 bit floating point number with integer
value equal to the source value
32 bit 16 bit garbage: least significant 16 bits of
the source value, however encoded
6. If the destination channel is read-only (i.e. a PLC input register) then a
COMALARM will result.
4 7 ZZ * YY
Function Establishes an alarm mode link with RC ZZ as the source
channel and YY as the destination channel. Channel ZZ’s
alarm status will be written to YY’s net address once per scan
loop. A 1 is written if any alarm exists, otherwise zero.
Response remote channel ZZ alarm link to remote channel YY or,
remote channel (ZZ,YY) not programmed, if no net address, or,
remote channel (ZZ,YY) already linked, if multiple sources, or
link chain would result.
4 7 ZZ * YY *
Function Establishes a data mode link with RC ZZ as the source channel
and YY as the destination. The value from ZZ’s net address is
written to YY’s net address once per scan loop.
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