Sy/Mate Plus Advanced LET instruction LD/LAG

I'm trying to understand some old PID logic in a Sy/Mate Plus 600 PLC.
Does anyone know what the syntax means for the advanced LET instruction (049) LD/LAG? In the manual it says: "performs the lead/lag function on a process variable i.e.
[LET S0090 = 0061 049]

I know the 049 refers to the Ld/LAG function BUT what is the 0061? the time delay, gain, an operating mode or a register? The 0061 doesn't appear to be a register in my program as the instances where the LD/LAG is used the equivelant numbers aren't assigned registers.

Thanks for the help.

If there is a ; between them, like this
LET S0090 = 0061;049 it means 61 goes into reg 90, and 49 goes into reg 91. sure something isn't missing?
George

Thanks for the reply. I am aware of the ";" in the LET instruction to load consecutive registers but in this case there is no ";" in between the operands to the right of the equals sign just spaces. This is exactly the way it appears in the manual "LET S0090 = 0061 049" in the program I am looking at it it is represented as follows:
LD/LAG
[LET S1106 = 01161 049]

LD/LAG
[LET S1378 = 01371 049]

I'm beginning to think the 01161 and 01371 above are IN FACT REGISTERS S1161 and S1371 but I'M still not convinced.

Any Sy/Mate experts?

Any Sy/Mate experts out there that know the syntax for the advanced LET instruction code number 049 Lead/Lag?

You can down load a copy of the model 600 instructions from here.
http://ecatalog.squared.com/techlib/docdetail.cfm?oid=09008926801077bd

Chapter 9 is for PID

Page 89 covers Lead-Lag
The number preceding (SPEC)49 is a pointer to the first register in a block of 7 consecutives registers that contains the Lead-Lag parameters.

Thanks Jim, that was exactly the info I needed.
Cheers,
Ken:beerchug: